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24x+18-4x=21x-12
We move all terms to the left:
24x+18-4x-(21x-12)=0
We add all the numbers together, and all the variables
20x-(21x-12)+18=0
We get rid of parentheses
20x-21x+12+18=0
We add all the numbers together, and all the variables
-1x+30=0
We move all terms containing x to the left, all other terms to the right
-x=-30
x=-30/-1
x=+30
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