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Anonymous
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16y3 / 20y4 = 16/20 * y3/y4 = 4/5 * y3-4 = 4/5 * y-1 or 4/5y
6y-y3 = 3
x3-y3
-y3 + 7y3
You would need to know the value of either x or y, so that you could solve for the one independent variable.