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