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3x+6(x-20)=420
We move all terms to the left:
3x+6(x-20)-(420)=0
We multiply parentheses
3x+6x-120-420=0
We add all the numbers together, and all the variables
9x-540=0
We move all terms containing x to the left, all other terms to the right
9x=540
x=540/9
x=60
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