-20=-y/4 - solution

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Solution for -20=-y/4 equation:

y in (-oo:+oo)

-20 = -y/4 // + -y/4

-(-y/4)-20 = 0

(1/4)*y-20 = 0

1/4*y-20 = 0 // + 20

1/4*y = 20 // : 1/4

y = 20/1/4

y = 80

y = 80

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