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## Answers

Let's start with an example :

1.Twice a number decreased by 17 is 15.What is the number?

We sometimes encounter this problems but as we keep practicing we might just mental math them.

These are the steps to solve.

1. Analyze the problem carefully for given and some hints.

2.Remember this things, the words is and was is a word that tell the = sign.

3.Solve:

The formula for this question is :

2x-17=15

4.Simplify.

2x-17=15

2x=15+17 ----> i transfered like terms ( be careful when transfering).

2x=32

2x/2=32/2 ----> divide both sides by 2

x=16

Proof:

2x or 16*2 is equal to 32 decreased by 17 is 15.

Remember:

The number I divided to the both sides of the equation comes from 2x which any other number multiplied by x

will be the number to divide the both sides of the equation in the last part of simpliying.