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-10+x/7=-13
We move all terms to the left:
-10+x/7-(-13)=0
We add all the numbers together, and all the variables
x/7+3=0
We multiply all the terms by the denominator
x+3*7=0
We add all the numbers together, and all the variables
x+21=0
We move all terms containing x to the left, all other terms to the right
x=-21
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