(7a+3)+(-1a-5)=15

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Solution for (7a+3)+(-1a-5)=15 equation: 



(7a+3)+(-1a-5)=15

We move all terms to the left:

(7a+3)+(-1a-5)-(15)=0

We get rid of parentheses

7a-1a+3-5-15=0

We add all the numbers together, and all the variables

6a-17=0

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

6a=17

a=17/6

a=2+5/6

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