x+1/4x=90 - solution

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Solution for x+1/4x=90 equation:

x in (-oo:+oo)

x+(1/4)*x = 90 // - 90

x+(1/4)*x-90 = 0

5/4*x-90 = 0 // + 90

5/4*x = 90 // : 5/4

x = 90/5/4

x = 72

x = 72

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