x^2+21/8x=5/8x

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Solution for x^2+21/8x=5/8x equation: 


x in (-oo:+oo)

x^2+(21/8)*x = (5/8)*x // - (5/8)*x

x^2+(21/8)*x-((5/8)*x) = 0

x^2+(21/8)*x+(-5/8)*x = 0

x^2+2*x = 0

DELTA = 2^2-(0*1*4)

DELTA = 4

DELTA > 0

x = (4^(1/2)-2)/(1*2) or x = (-4^(1/2)-2)/(1*2)

x = 0 or x = -2

x in { -2, 0 }

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