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x in (-oo:+oo)
2*(-6*x-9) = -90 // + 90
2*(-6*x-9)+90 = 0
2*(-6*x-9)+90 = 0
72-12*x = 0
72-12*x = 0
72-12*x = 0 // - 72
-12*x = -72 // : -12
x = -72/(-12)
x = 6
x = 6
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