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6x-7(3x-18)=-216
We move all terms to the left:
6x-7(3x-18)-(-216)=0
We add all the numbers together, and all the variables
6x-7(3x-18)+216=0
We multiply parentheses
6x-21x+126+216=0
We add all the numbers together, and all the variables
-15x+342=0
We move all terms containing x to the left, all other terms to the right
-15x=-342
x=-342/-15
x=22+4/5
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