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Y in (-oo:+oo)
(1/3)*Y = 21/3 // - 21/3
(1/3)*Y-(21/3) = 0
(1/3)*Y-7 = 0
1/3*Y-7 = 0 // + 7
1/3*Y = 7 // : 1/3
Y = 7/1/3
Y = 21
Y = 21
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