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x in (-oo:+oo)
(-3/2)*(x+9) = -18 // + 18
(-3/2)*(x+9)+18 = 0
18-3/2*(x+9) = 0
18-3/2*(x+9) = 0
9/2-3/2*x = 0
9/2-3/2*x = 0
9/2-3/2*x = 0 // - 9/2
-3/2*x = -9/2 // : -3/2
x = -9/2/(-3/2)
x = 3
x = 3
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