20=-4/7y

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Solution for 20=-4/7y equation: 


y in (-oo:+oo)

20 = (-4/7)*y // - (-4/7)*y

20-((-4/7)*y) = 0

(4/7)*y+20 = 0

4/7*y+20 = 0 // - 20

4/7*y = -20 // : 4/7

y = -20/4/7

y = -35

y = -35

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