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137=-x+210
We move all terms to the left:
137-(-x+210)=0
We add all the numbers together, and all the variables
-(-1x+210)+137=0
We get rid of parentheses
1x-210+137=0
We add all the numbers together, and all the variables
x-73=0
We move all terms containing x to the left, all other terms to the right
x=73
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