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y in (-oo:+oo)
(-2/3)*(y-9) = 6 // - 6
(-2/3)*(y-9)-6 = 0
-2/3*(y-9)-6 = 0
-2/3*(y-9)-6 = 0
-2/3*y = 0
(-2*y)/3 = 0
(-2*y)/3 = 0 // * 3
-2*y = 0
-2*y = 0 // : -2
y = 0
y = 0
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