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x-3x=-20x+18
We move all terms to the left:
x-3x-(-20x+18)=0
We add all the numbers together, and all the variables
-2x-(-20x+18)=0
We get rid of parentheses
-2x+20x-18=0
We add all the numbers together, and all the variables
18x-18=0
We move all terms containing x to the left, all other terms to the right
18x=18
x=18/18
x=1
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