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y in (-oo:+oo)
(2/5)*y+7 = (3/5)*y-4 // - (3/5)*y-4
(2/5)*y-((3/5)*y)+4+7 = 0
(2/5)*y+(-3/5)*y+4+7 = 0
11-1/5*y = 0 // - 11
-1/5*y = -11 // : -1/5
y = -11/(-1/5)
y = 55
y = 55
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