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x in (-oo:+oo)
2*x-9 = 9-4*x // - 9-4*x
2*x-(-4*x)-9-9 = 0
2*x+4*x-9-9 = 0
6*x-18 = 0 // + 18
6*x = 18 // : 6
x = 18/6
x = 3
x = 3
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