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112=90-x-12
We move all terms to the left:
112-(90-x-12)=0
We add all the numbers together, and all the variables
-(-1x+78)+112=0
We get rid of parentheses
1x-78+112=0
We add all the numbers together, and all the variables
x+34=0
We move all terms containing x to the left, all other terms to the right
x=-34
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