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y in (-oo:+oo)
(4*(4*y+3))/3+(5*y)/4 = 0
(4^2*(4*y+3))/(3*4)+(3*5*y)/(3*4) = 0
4^2*(4*y+3)+3*5*y = 0
79*y+48 = 0
(79*y+48)/(3*4) = 0
(79*y+48)/(3*4) = 0 // * 3*4
79*y+48 = 0
79*y+48 = 0 // - 48
79*y = -48 // : 79
y = -48/79
y = -48/79
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