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x in (-oo:+oo)
6*x-1 = 39-4*x // - 39-4*x
6*x-(-4*x)-39-1 = 0
6*x+4*x-39-1 = 0
10*x-40 = 0 // + 40
10*x = 40 // : 10
x = 40/10
x = 4
x = 4
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