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168=18(x)+12(2x)
We move all terms to the left:
168-(18(x)+12(2x))=0
We add all the numbers together, and all the variables
-(+140x)+168=0
We get rid of parentheses
-140x+168=0
We move all terms containing x to the left, all other terms to the right
-140x=-168
x=-168/-140
x=1+1/5
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