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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

If you want to check if your answer is correct, substitute your answer to the variable in the original equation. 1. 3x-2=7 x = 3 So, 3(3)-2=7 9-2=7 7=7