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40(3x+10)=180
We move all terms to the left:
40(3x+10)-(180)=0
We multiply parentheses
120x+400-180=0
We add all the numbers together, and all the variables
120x+220=0
We move all terms containing x to the left, all other terms to the right
120x=-220
x=-220/120
x=-1+5/6
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