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1.2x=x-100
We move all terms to the left:
1.2x-(x-100)=0
We get rid of parentheses
1.2x-x+100=0
We add all the numbers together, and all the variables
0.2x+100=0
We move all terms containing x to the left, all other terms to the right
0.2x=-100
x=-100/0.2
x=-500
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