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y in (-oo:+oo)
(-1/2)*y+5/2 = (-3/5)*y-4 // - (-3/5)*y-4
(-1/2)*y-((-3/5)*y)+5/2+4 = 0
(-1/2)*y+(3/5)*y+5/2+4 = 0
1/10*y+13/2 = 0 // - 13/2
1/10*y = -13/2 // : 1/10
y = -13/2/1/10
y = -65
y = -65
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