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5x-3(4x+2)=90
We move all terms to the left:
5x-3(4x+2)-(90)=0
We multiply parentheses
5x-12x-6-90=0
We add all the numbers together, and all the variables
-7x-96=0
We move all terms containing x to the left, all other terms to the right
-7x=96
x=96/-7
x=-13+5/7
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