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(x-105)/21=15
We move all terms to the left:
(x-105)/21-(15)=0
We multiply all the terms by the denominator
(x-105)-15*21=0
We add all the numbers together, and all the variables
(x-105)-315=0
We get rid of parentheses
x-105-315=0
We add all the numbers together, and all the variables
x-420=0
We move all terms containing x to the left, all other terms to the right
x=420
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