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5a+8(-2a)=7
We move all terms to the left:
5a+8(-2a)-(7)=0
We multiply parentheses
5a-16a-7=0
We add all the numbers together, and all the variables
-11a-7=0
We move all terms containing a to the left, all other terms to the right
-11a=7
a=7/-11
a=-7/11
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