Answer:
You first subtract 5x from both sides and end up with -3y=21-5x. In order to isolate the variable you need to divide -3 from both sides. Your equation would then be y= -7+ 5/3x.
Explanation:
y=53x-7
5x-3y=21
-3y=-5x+21
divide by 3
y=5/3x-7
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