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420x=315x+8505
We move all terms to the left:
420x-(315x+8505)=0
We get rid of parentheses
420x-315x-8505=0
We add all the numbers together, and all the variables
105x-8505=0
We move all terms containing x to the left, all other terms to the right
105x=8505
x=8505/105
x=81
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