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y in (-oo:+oo)
(2/3)*(y+1/2) = (-2/3)*(1-5) // - (-2/3)*(1-5)
(2/3)*(y+1/2)-((-2/3)*(1-5)) = 0
(2/3)*(y+1/2)+(2/3)*(1-5) = 0
2/3*(y+1/2)-8/3 = 0
(2/3*3*(y+1/2))/3-8/3 = 0
2/3*3*(y+1/2)-8 = 0
2*y-7 = 0
(2*y-7)/3 = 0
(2*y-7)/3 = 0 // * 3
2*y-7 = 0
2*y-7 = 0 // + 7
2*y = 7 // : 2
y = 7/2
y = 7/2
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