60=(1/2x+7)*x

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Solution for 60=(1/2x+7)*x equation: 


x in (-oo:+oo)

60 = x*((1/2)*x+7) // - x*((1/2)*x+7)

60-(x*((1/2)*x+7)) = 0

60-1*x*(1/2*x+7) = 0

60-1*x*(1/2*x+7) = 0

60-1/2*x^2-7*x = 0

60-1/2*x^2-7*x = 0

60-1/2*x^2-7*x = 0

DELTA = (-7)^2-(-1/2*4*60)

DELTA = 169

DELTA > 0

x = (169^(1/2)+7)/(-1/2*2) or x = (7-169^(1/2))/(-1/2*2)

x = -20 or x = 6

(x+20)*(x-6) = 0

(x+20)*(x-6) = 0

( x+20 )

x+20 = 0 // - 20

x = -20

( x-6 )

x-6 = 0 // + 6

x = 6

x in { -20, 6 }

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