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x in (-oo:+oo)
6*x+5 = 23-3*x // - 23-3*x
6*x-(-3*x)-23+5 = 0
6*x+3*x-23+5 = 0
9*x-18 = 0 // + 18
9*x = 18 // : 9
x = 18/9
x = 2
x = 2
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