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-1x-7(-7x-18)=30
We move all terms to the left:
-1x-7(-7x-18)-(30)=0
We multiply parentheses
-1x+49x+126-30=0
We add all the numbers together, and all the variables
48x+96=0
We move all terms containing x to the left, all other terms to the right
48x=-96
x=-96/48
x=-2
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