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-x/7=-18
We move all terms to the left:
-x/7-(-18)=0
We add all the numbers together, and all the variables
-x/7+18=0
We multiply all the terms by the denominator
-x+18*7=0
We add all the numbers together, and all the variables
-1x+126=0
We move all terms containing x to the left, all other terms to the right
-x=-126
x=-126/-1
x=+126
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