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24=-5x-7x
We move all terms to the left:
24-(-5x-7x)=0
We add all the numbers together, and all the variables
-(-12x)+24=0
We get rid of parentheses
12x+24=0
We move all terms containing x to the left, all other terms to the right
12x=-24
x=-24/12
x=-2
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