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y in (-oo:+oo)
(2/5)*y+10 = (-1/2)*y+6 // - (-1/2)*y+6
(2/5)*y-((-1/2)*y)-6+10 = 0
(2/5)*y+(1/2)*y-6+10 = 0
9/10*y+4 = 0 // - 4
9/10*y = -4 // : 9/10
y = -4/9/10
y = -40/9
y = -40/9
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