15=10a-7a

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Solution for 15=10a-7a equation: 



15=10a-7a

We move all terms to the left:

15-(10a-7a)=0

We add all the numbers together, and all the variables

-(+3a)+15=0

We get rid of parentheses

-3a+15=0

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

-3a=-15

a=-15/-3

a=+5

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