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y in (-oo:+oo)
(1/2)*y-3/7 = -4/5 // + -4/5
(1/2)*y-3/7-(-4/5) = 0
(1/2)*y-3/7+4/5 = 0
1/2*y+13/35 = 0 // - 13/35
1/2*y = -13/35 // : 1/2
y = -13/35/1/2
y = -26/35
y = -26/35
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