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187=125-x
We move all terms to the left:
187-(125-x)=0
We add all the numbers together, and all the variables
-(-1x+125)+187=0
We get rid of parentheses
1x-125+187=0
We add all the numbers together, and all the variables
x+62=0
We move all terms containing x to the left, all other terms to the right
x=-62
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