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180=2x+31
We move all terms to the left:
180-(2x+31)=0
We get rid of parentheses
-2x-31+180=0
We add all the numbers together, and all the variables
-2x+149=0
We move all terms containing x to the left, all other terms to the right
-2x=-149
x=-149/-2
x=74+1/2
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