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6x+2(2x-15)=-90
We move all terms to the left:
6x+2(2x-15)-(-90)=0
We add all the numbers together, and all the variables
6x+2(2x-15)+90=0
We multiply parentheses
6x+4x-30+90=0
We add all the numbers together, and all the variables
10x+60=0
We move all terms containing x to the left, all other terms to the right
10x=-60
x=-60/10
x=-6
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