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