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(y-4)(y-3) = 0
y= 4
y= 3
y²-7y=-12
y²-7y+ 49/4= -12 + 49/4
(y-7/2)²=-48/4+49/4
(y-7/2)²=1/4
y-7/2=1/4 atau y-7/2=-1/4
y=1/4+14/4 atau y=-1/4+14/4
y=15/4 atau y=13/4
y=3,75 atau y=3,25