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y in (-oo:+oo)
y/10 = 2.5 // - 2.5
y/10-2.5 = 0
1/10*y-2.5 = 0 // + 2.5
1/10*y = 2.5 // : 1/10
y = 2.5/1/10
y = 25
y = 25
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