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-8(2x+7)=90
We move all terms to the left:
-8(2x+7)-(90)=0
We multiply parentheses
-16x-56-90=0
We add all the numbers together, and all the variables
-16x-146=0
We move all terms containing x to the left, all other terms to the right
-16x=146
x=146/-16
x=-9+1/8
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