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100-x=-50+2x
We move all terms to the left:
100-x-(-50+2x)=0
We add all the numbers together, and all the variables
-x-(2x-50)+100=0
We add all the numbers together, and all the variables
-1x-(2x-50)+100=0
We get rid of parentheses
-1x-2x+50+100=0
We add all the numbers together, and all the variables
-3x+150=0
We move all terms containing x to the left, all other terms to the right
-3x=-150
x=-150/-3
x=+50
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