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18-2x=20-100
We move all terms to the left:
18-2x-(20-100)=0
We add all the numbers together, and all the variables
-2x+18-(-80)=0
We add all the numbers together, and all the variables
-2x+98=0
We move all terms containing x to the left, all other terms to the right
-2x=-98
x=-98/-2
x=+49
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