10a-(a-3)=15

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Solution for 10a-(a-3)=15 equation: 



10a-(a-3)=15

We move all terms to the left:

10a-(a-3)-(15)=0

We get rid of parentheses

10a-a+3-15=0

We add all the numbers together, and all the variables

9a-12=0

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

9a=12

a=12/9

a=1+1/3

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