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180-x=40+2x
We move all terms to the left:
180-x-(40+2x)=0
We add all the numbers together, and all the variables
-x-(2x+40)+180=0
We add all the numbers together, and all the variables
-1x-(2x+40)+180=0
We get rid of parentheses
-1x-2x-40+180=0
We add all the numbers together, and all the variables
-3x+140=0
We move all terms containing x to the left, all other terms to the right
-3x=-140
x=-140/-3
x=46+2/3
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