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2x+156=9x-12
We move all terms to the left:
2x+156-(9x-12)=0
We get rid of parentheses
2x-9x+12+156=0
We add all the numbers together, and all the variables
-7x+168=0
We move all terms containing x to the left, all other terms to the right
-7x=-168
x=-168/-7
x=+24
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