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6x-3(7x-18)=-51
We move all terms to the left:
6x-3(7x-18)-(-51)=0
We add all the numbers together, and all the variables
6x-3(7x-18)+51=0
We multiply parentheses
6x-21x+54+51=0
We add all the numbers together, and all the variables
-15x+105=0
We move all terms containing x to the left, all other terms to the right
-15x=-105
x=-105/-15
x=+7
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