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(4+x)3=30+x
We move all terms to the left:
(4+x)3-(30+x)=0
We add all the numbers together, and all the variables
(x+4)3-(x+30)=0
We multiply parentheses
3x-(x+30)+12=0
We get rid of parentheses
3x-x-30+12=0
We add all the numbers together, and all the variables
2x-18=0
We move all terms containing x to the left, all other terms to the right
2x=18
x=18/2
x=9
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