(3y/3y)+(12y/3y)-(21/3y)

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Solution for (3y/3y)+(12y/3y)-(21/3y) equation: 


y in (-oo:+oo)

((3*y)/3)*y+((12*y)/3)*y-((21/3)*y) = 0

((3*y)/3)*y+((12*y)/3)*y-7*y = 0

5*y^2-7*y = 0

DELTA = (-7)^2-(0*4*5)

DELTA = 49

DELTA > 0

y = (49^(1/2)+7)/(2*5) or y = (7-49^(1/2))/(2*5)

y = 7/5 or y = 0

y in { 0, 7/5 }

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