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y in (-oo:+oo)
9*y-(4*(y/5)) = 40 // - 40
9*y-(4*(y/5))-40 = 0
9*y+(-4/5)*y-40 = 0
41/5*y-40 = 0 // + 40
41/5*y = 40 // : 41/5
y = 40/41/5
y = 200/41
y = 200/41
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