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-7(5a+8)-a=124
We move all terms to the left:
-7(5a+8)-a-(124)=0
We add all the numbers together, and all the variables
-1a-7(5a+8)-124=0
We multiply parentheses
-1a-35a-56-124=0
We add all the numbers together, and all the variables
-36a-180=0
We move all terms containing a to the left, all other terms to the right
-36a=180
a=180/-36
a=-5
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