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-x/3-7=-13
We move all terms to the left:
-x/3-7-(-13)=0
We add all the numbers together, and all the variables
-x/3+6=0
We multiply all the terms by the denominator
-x+6*3=0
We add all the numbers together, and all the variables
-1x+18=0
We move all terms containing x to the left, all other terms to the right
-x=-18
x=-18/-1
x=+18
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