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y in (-oo:+oo)
y-((3/7)*y)+1/2 = (-4/3)*(y-(2/7)) // - (-4/3)*(y-(2/7))
y-((-4/3)*(y-(2/7)))-((3/7)*y)+1/2 = 0
(4/3)*(y-2/7)+y+(-3/7)*y+1/2 = 0
4/3*(y-2/7)+y+(-3*y)/7+1/2 = 0
(4/3*2*7*(y-2/7))/(2*7)+(2*7*y)/(2*7)+(-3*2*y)/(2*7)+(1*7)/(2*7) = 0
4/3*2*7*(y-2/7)+2*7*y-3*2*y+1*7 = 0
98/3*y-6*y-16/3+7 = 0
80/3*y-16/3+7 = 0
80/3*y+5/3 = 0
(80/3*y+5/3)/(2*7) = 0
(80/3*y+5/3)/(2*7) = 0 // * 2*7
80/3*y+5/3 = 0
80/3*y+5/3 = 0 // - 5/3
80/3*y = -5/3 // : 80/3
y = -5/3/80/3
y = -1/16
y = -1/16
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