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5x+24=21x+72
We move all terms to the left:
5x+24-(21x+72)=0
We get rid of parentheses
5x-21x-72+24=0
We add all the numbers together, and all the variables
-16x-48=0
We move all terms containing x to the left, all other terms to the right
-16x=48
x=48/-16
x=-3
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