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x/2-10=-20
We move all terms to the left:
x/2-10-(-20)=0
We add all the numbers together, and all the variables
x/2+10=0
We multiply all the terms by the denominator
x+10*2=0
We add all the numbers together, and all the variables
x+20=0
We move all terms containing x to the left, all other terms to the right
x=-20
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