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y in (-oo:+oo)
40*y = 43/5 // - 43/5
40*y-(43/5) = 0
40*y-43/5 = 0
40*y-43/5 = 0 // + 43/5
40*y = 43/5 // : 40
y = 43/5/40
y = 43/200
y = 43/200
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