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9x-21=4x+58+2x
We move all terms to the left:
9x-21-(4x+58+2x)=0
We add all the numbers together, and all the variables
9x-(6x+58)-21=0
We get rid of parentheses
9x-6x-58-21=0
We add all the numbers together, and all the variables
3x-79=0
We move all terms containing x to the left, all other terms to the right
3x=79
x=79/3
x=26+1/3
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