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-30+x+18+4x=10x-4-9x-20
We move all terms to the left:
-30+x+18+4x-(10x-4-9x-20)=0
We add all the numbers together, and all the variables
x+4x-(x-24)-30+18=0
We add all the numbers together, and all the variables
5x-(x-24)-12=0
We get rid of parentheses
5x-x+24-12=0
We add all the numbers together, and all the variables
4x+12=0
We move all terms containing x to the left, all other terms to the right
4x=-12
x=-12/4
x=-3
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