7a-5a=15-a

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Solution for 7a-5a=15-a equation: 



7a-5a=15-a

We move all terms to the left:

7a-5a-(15-a)=0

We add all the numbers together, and all the variables

7a-5a-(-1a+15)=0

We add all the numbers together, and all the variables

2a-(-1a+15)=0

We get rid of parentheses

2a+1a-15=0

We add all the numbers together, and all the variables

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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