-21=-3/4x

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Solution for -21=-3/4x equation: 


x in (-oo:+oo)

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

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