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287=162-x
We move all terms to the left:
287-(162-x)=0
We add all the numbers together, and all the variables
-(-1x+162)+287=0
We get rid of parentheses
1x-162+287=0
We add all the numbers together, and all the variables
x+125=0
We move all terms containing x to the left, all other terms to the right
x=-125
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