15-7a=20-2a

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Solution for 15-7a=20-2a equation: 



15-7a=20-2a

We move all terms to the left:

15-7a-(20-2a)=0

We add all the numbers together, and all the variables

-7a-(-2a+20)+15=0

We get rid of parentheses

-7a+2a-20+15=0

We add all the numbers together, and all the variables

-5a-5=0

We move all terms containing a to the left, all other terms to the right

-5a=5

a=5/-5

a=-1

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