# Solve for the unknown variable.Show your solution. 1)3x-2=7 2)2a+15=5 3)5+4b=-11 4)x -----+8=6 3 5)4d-5=2d+7 6)9c+3=8c+5 7)5(2x-1)+6=7x-8 8)4y+5 --------=2y+7 3 9)4x=2x+8 10)10m-10=10 -Help please

2
by yakachie

• Brainly User
2015-11-19T16:34:49+08:00

### This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
1) 3x - 2 = 7
3x = 7 + 2
3x = 9
3x/3 = 9/3
x = 3

2)  2a + 15 = 5
2a = 5 - 15
2a = -10
2a/2 = -10/2
a = - 5

3)  5 + 4b = - 11
4b = - 11 - 5
4b = - 16
4b/4 = - 16/4
b = - 4

4)  x + 8 = 63
x = 63 - 8
x = 55

5)  4d - 5 = 2d + 7
4d - 2d = 7 + 5
2d = 12
2d/2 = 12/2
d = 6

6)  9c + 3 = 8c + 5
9c - 8c = 5 - 3
c = 2

7)  5(2x - 1) + 6 = 7x - 8
10x - 5 + 6 = 7x - 8
10x + 1 = 7x - 8
10x - 7x = -8 -1
3x = -9
3x/3 = -9/3
x = -3

8) 4y + 5 = 2y + 73
4y- 2y = 73 - 5
2y = 72
y = 36

9)  4x = 2x + 8
4x - 2x = 8
2x = 8
2x/2 = 8/2
x = 4

10)  10m - 10 = 10
10m = 10 + 10
10m = 20
10m/10 = 20/10
m = 2

(Note
:  I hope you posted items 4 and 8 correctly :-)

2015-11-19T19:06:44+08:00
I'll just tell you HOW to solve, but I won't solve EVERYTHING.
1.) 3x-2=7

3x=7+2 (Transpose 2 to isolate the variables from the real nos. Its sign will be its
opposite value)

3x=9 (Simplify)

3x = 9
3      3 (Divide both sides with the numerical of the varaiable)

x = 3 (Simplify and Viola!)

2.) 2a + 15 = 5

2a = 5 -15 (Transpose)

2a = -10 (Simplify)

2a = -10
2        2  (Divide by coefficient)

a = -5