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180-x=2x+51
We move all terms to the left:
180-x-(2x+51)=0
We add all the numbers together, and all the variables
-1x-(2x+51)+180=0
We get rid of parentheses
-1x-2x-51+180=0
We add all the numbers together, and all the variables
-3x+129=0
We move all terms containing x to the left, all other terms to the right
-3x=-129
x=-129/-3
x=+43
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