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-20x+140=30x-60
We move all terms to the left:
-20x+140-(30x-60)=0
We get rid of parentheses
-20x-30x+60+140=0
We add all the numbers together, and all the variables
-50x+200=0
We move all terms containing x to the left, all other terms to the right
-50x=-200
x=-200/-50
x=+4
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