-20=-5/7y

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Solution for -20=-5/7y equation: 


y in (-oo:+oo)

-20 = (-5/7)*y // - (-5/7)*y

-((-5/7)*y)-20 = 0

(5/7)*y-20 = 0

5/7*y-20 = 0 // + 20

5/7*y = 20 // : 5/7

y = 20/5/7

y = 28

y = 28

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