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y in (-oo:+oo)
(4/5)*y+2 = (2/5)*y-7 // - (2/5)*y-7
(4/5)*y-((2/5)*y)+2+7 = 0
(4/5)*y+(-2/5)*y+2+7 = 0
2/5*y+9 = 0 // - 9
2/5*y = -9 // : 2/5
y = -9/2/5
y = -45/2
y = -45/2
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