y/3-21=-18 - solution

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Solution for y/3-21=-18 equation:

y in (-oo:+oo)

y/3-21 = -18 // + 18

y/3-21+18 = 0

1/3*y-3 = 0 // + 3

1/3*y = 3 // : 1/3

y = 3/1/3

y = 9

y = 9

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