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158=290-x
We move all terms to the left:
158-(290-x)=0
We add all the numbers together, and all the variables
-(-1x+290)+158=0
We get rid of parentheses
1x-290+158=0
We add all the numbers together, and all the variables
x-132=0
We move all terms containing x to the left, all other terms to the right
x=132
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