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1200=40(x)+18(x)
We move all terms to the left:
1200-(40(x)+18(x))=0
We add all the numbers together, and all the variables
-(+58x)+1200=0
We get rid of parentheses
-58x+1200=0
We move all terms containing x to the left, all other terms to the right
-58x=-1200
x=-1200/-58
x=20+20/29
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