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y in (-oo:+oo)
y/3 = 6.6 // - 6.6
y/3-6.6 = 0
1/3*y-6.6 = 0 // + 6.6
1/3*y = 6.6 // : 1/3
y = 6.6/1/3
y = 19.8000002
y = 19.8000002
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