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-x/7=20
We move all terms to the left:
-x/7-(20)=0
We multiply all the terms by the denominator
-x-20*7=0
We add all the numbers together, and all the variables
-1x-140=0
We move all terms containing x to the left, all other terms to the right
-x=140
x=140/-1
x=-140
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