(20y2+10y)/4

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Solution for (20y2+10y)/4 equation: 


y in (-oo:+oo)

(20*y^2+10*y)/4 = 0

20*y^2+10*y = 0

10*y*(2*y+1) = 0

2*y+1 = 0 // - 1

2*y = -1 // : 2

y = -1/2

10*y*(y+1/2) = 0

(10*y*(y+1/2))/4 = 0

( 10*y )

10*y = 0 // : 10

y = 0

( y+1/2 )

y+1/2 = 0 // - 1/2

y = -1/2

y in { 0, -1/2 }

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