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x in (-oo:+oo)
(-9/2)*(x+3) = 27 // - 27
(-9/2)*(x+3)-27 = 0
-9/2*(x+3)-27 = 0
-9/2*(x+3)-27 = 0
-9/2*x-81/2 = 0
-9/2*x-81/2 = 0
-9/2*x-81/2 = 0 // + 81/2
-9/2*x = 81/2 // : -9/2
x = 81/2/(-9/2)
x = -9
x = -9
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