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y in (-oo:+oo)
(1/2)*(30-(6*y)) = 15 // - 15
(1/2)*(30-(6*y))-15 = 0
(1/2)*(30-6*y)-15 = 0
1/2*(30-6*y)-15 = 0
1/2*(30-6*y)-15 = 0
-3*y = 0
-3*y = 0
-3*y = 0 // : -3
y = 0
y = 0
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