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y in (-oo:+oo)
y/3 = 5.3 // - 5.3
y/3-5.3 = 0
1/3*y-5.3 = 0 // + 5.3
1/3*y = 5.3 // : 1/3
y = 5.3/1/3
y = 15.90000016
y = 15.90000016
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