42=-7/4y

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Solution for 42=-7/4y equation: 


y in (-oo:+oo)

42 = (-7/4)*y // - (-7/4)*y

42-((-7/4)*y) = 0

(7/4)*y+42 = 0

7/4*y+42 = 0 // - 42

7/4*y = -42 // : 7/4

y = -42/7/4

y = -24

y = -24

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