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y in (-oo:+oo)
(3*(y-5))/4-(4*y) = (3*(y-3))/2 // - (3*(y-3))/2
(3*(y-5))/4-((3*(y-3))/2)-(4*y) = 0
(3*(y-5))/4+(-3/2)*(y-3)-4*y = 0
(3*(y-5))/4-3/2*(y-3)-4*y = 0
(3*(y-5))/4+(-3/2*4*(y-3))/4+(-4*4*y)/4 = 0
3*(y-5)-3/2*4*(y-3)-4*4*y = 0
3-3*y-16*y = 0
3-19*y = 0
(3-19*y)/4 = 0
(3-19*y)/4 = 0 // * 4
3-19*y = 0
3-19*y = 0 // - 3
-19*y = -3 // : -19
y = -3/(-19)
y = 3/19
y = 3/19
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