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y in (-oo:+oo)
1/2 = 5-(y/10) // - 5-(y/10)
y/10+1/2-5 = 0
1/10*y-9/2 = 0 // + 9/2
1/10*y = 9/2 // : 1/10
y = 9/2/1/10
y = 45
y = 45
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