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-140-30x=-140-30x
We move all terms to the left:
-140-30x-(-140-30x)=0
We add all the numbers together, and all the variables
-30x-(-30x-140)-140=0
We get rid of parentheses
-30x+30x+140-140=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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