y/9=21

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Solution for y/9=21 equation: 


y in (-oo:+oo)

y/9 = 21 // - 21

y/9-21 = 0

1/9*y-21 = 0 // + 21

1/9*y = 21 // : 1/9

y = 21/1/9

y = 189

y = 189

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