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180=40+3x+2x
We move all terms to the left:
180-(40+3x+2x)=0
We add all the numbers together, and all the variables
-(5x+40)+180=0
We get rid of parentheses
-5x-40+180=0
We add all the numbers together, and all the variables
-5x+140=0
We move all terms containing x to the left, all other terms to the right
-5x=-140
x=-140/-5
x=+28
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