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12x+18-7(2x+4)=x
We move all terms to the left:
12x+18-7(2x+4)-(x)=0
We add all the numbers together, and all the variables
11x-7(2x+4)+18=0
We multiply parentheses
11x-14x-28+18=0
We add all the numbers together, and all the variables
-3x-10=0
We move all terms containing x to the left, all other terms to the right
-3x=10
x=10/-3
x=-3+1/3
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