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120-50=89-x
We move all terms to the left:
120-50-(89-x)=0
We add all the numbers together, and all the variables
-(-1x+89)+120-50=0
We add all the numbers together, and all the variables
-(-1x+89)+70=0
We get rid of parentheses
1x-89+70=0
We add all the numbers together, and all the variables
x-19=0
We move all terms containing x to the left, all other terms to the right
x=19
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