9(7-y)/2=-y

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Solution for 9(7-y)/2=-y equation: 


y in (-oo:+oo)

(9*(7-y))/2 = -y // + y

(9*(7-y))/2+y = 0

(9*(7-y))/2+(2*y)/2 = 0

9*(7-y)+2*y = 0

63-7*y = 0

(63-7*y)/2 = 0

(63-7*y)/2 = 0 // * 2

63-7*y = 0

63-7*y = 0 // - 63

-7*y = -63 // : -7

y = -63/(-7)

y = 9

y = 9

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