21=-3/4x

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Solution for 21=-3/4x equation: 


x in (-oo:+oo)

21 = (-3/4)*x // - (-3/4)*x

21-((-3/4)*x) = 0

(3/4)*x+21 = 0

3/4*x+21 = 0 // - 21

3/4*x = -21 // : 3/4

x = -21/3/4

x = -28

x = -28

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