x-1/4x=21

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Solution for x-1/4x=21 equation: 


x in (-oo:+oo)

x-((1/4)*x) = 21 // - 21

x-((1/4)*x)-21 = 0

x+(-1/4)*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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