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y in (-oo:+oo)
15/2 = (3/2)*(3-7*y)+(17*y)/2 // - (3/2)*(3-7*y)+(17*y)/2
15/2-((3/2)*(3-7*y))-((17*y)/2) = 0
(-3/2)*(3-7*y)+(-17/2)*y+15/2 = 0
(-17*y)/2-3/2*(3-7*y)+15/2 = 0
(-3/2*2*(3-7*y))/2+(-17*y)/2+15/2 = 0
15-3/2*2*(3-7*y)-17*y = 0
4*y-9+15 = 0
4*y+6 = 0
(4*y+6)/2 = 0
(4*y+6)/2 = 0 // * 2
4*y+6 = 0
4*y+6 = 0 // - 6
4*y = -6 // : 4
y = -6/4
y = -3/2
y = -3/2
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