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-2x-7(-x*4)=90
We move all terms to the left:
-2x-7(-x*4)-(90)=0
We multiply parentheses
-2x+28x-90=0
We add all the numbers together, and all the variables
26x-90=0
We move all terms containing x to the left, all other terms to the right
26x=90
x=90/26
x=3+6/13
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