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x in (-oo:+oo)
15 = 2*x+4*x+9 // - 2*x+4*x+9
15-(2*x)-(4*x)-9 = 0
15-2*x-4*x-9 = 0
6-6*x = 0 // - 6
-6*x = -6 // : -6
x = -6/(-6)
x = 1
x = 1
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