y^2+441/4=-21y

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Solution for y^2+441/4=-21y equation: 


y in (-oo:+oo)

y^2+441/4 = -21*y // + -21*y

y^2-(-21*y)+441/4 = 0

y^2+21*y+441/4 = 0

y^2+21*y+441/4 = 0

DELTA = 21^2-(1*4*441/4)

DELTA = 0

y = -21/(1*2)

y = -21/2 or y = -21/2

y in { -21/2, -21/2 }

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