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376-12x=280-15x
We move all terms to the left:
376-12x-(280-15x)=0
We add all the numbers together, and all the variables
-12x-(-15x+280)+376=0
We get rid of parentheses
-12x+15x-280+376=0
We add all the numbers together, and all the variables
3x+96=0
We move all terms containing x to the left, all other terms to the right
3x=-96
x=-96/3
x=-32
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