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(5x/15)-(3x/15)=(8400/15)
We move all terms to the left:
(5x/15)-(3x/15)-((8400/15))=0
We add all the numbers together, and all the variables
(+5x/15)-(+3x/15)-(560)=0
We add all the numbers together, and all the variables
(+5x/15)-(+3x/15)-560=0
We get rid of parentheses
5x/15-3x/15-560=0
We multiply all the terms by the denominator
5x-3x-560*15=0
We add all the numbers together, and all the variables
2x-8400=0
We move all terms containing x to the left, all other terms to the right
2x=8400
x=8400/2
x=4200
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