-4=-2/7y

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Solution for -4=-2/7y equation: 


y in (-oo:+oo)

-4 = (-2/7)*y // - (-2/7)*y

-((-2/7)*y)-4 = 0

(2/7)*y-4 = 0

2/7*y-4 = 0 // + 4

2/7*y = 4 // : 2/7

y = 4/2/7

y = 14

y = 14

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