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12x-490=-5x+156
We move all terms to the left:
12x-490-(-5x+156)=0
We get rid of parentheses
12x+5x-156-490=0
We add all the numbers together, and all the variables
17x-646=0
We move all terms containing x to the left, all other terms to the right
17x=646
x=646/17
x=38
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