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7x-(3x+4)=6x-18
We move all terms to the left:
7x-(3x+4)-(6x-18)=0
We get rid of parentheses
7x-3x-6x-4+18=0
We add all the numbers together, and all the variables
-2x+14=0
We move all terms containing x to the left, all other terms to the right
-2x=-14
x=-14/-2
x=+7
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