3(7-y)/5=-y

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Solution for 3(7-y)/5=-y equation: 


y in (-oo:+oo)

(3*(7-y))/5 = -y // + y

(3*(7-y))/5+y = 0

(3*(7-y))/5+(5*y)/5 = 0

3*(7-y)+5*y = 0

2*y+21 = 0

(2*y+21)/5 = 0

(2*y+21)/5 = 0 // * 5

2*y+21 = 0

2*y+21 = 0 // - 21

2*y = -21 // : 2

y = -21/2

y = -21/2

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