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y in (-oo:+oo)
y/2 = 8.7 // - 8.7
y/2-8.7 = 0
1/2*y-8.7 = 0 // + 8.7
1/2*y = 8.7 // : 1/2
y = 8.7/1/2
y = 17.4
y = 17.4
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