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y in (-oo:+oo)
12*((1/2)*y+3) = 6 // - 6
12*((1/2)*y+3)-6 = 0
12*(1/2*y+3)-6 = 0
12*(1/2*y+3)-6 = 0
6*y+30 = 0
6*y+30 = 0
6*y+30 = 0 // - 30
6*y = -30 // : 6
y = -30/6
y = -5
y = -5
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