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