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7+x/4=-13
We move all terms to the left:
7+x/4-(-13)=0
We add all the numbers together, and all the variables
x/4+20=0
We multiply all the terms by the denominator
x+20*4=0
We add all the numbers together, and all the variables
x+80=0
We move all terms containing x to the left, all other terms to the right
x=-80
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