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315(125-x)=435
We move all terms to the left:
315(125-x)-(435)=0
We add all the numbers together, and all the variables
315(-1x+125)-435=0
We multiply parentheses
-315x+39375-435=0
We add all the numbers together, and all the variables
-315x+38940=0
We move all terms containing x to the left, all other terms to the right
-315x=-38940
x=-38940/-315
x=123+13/21
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