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x in (-oo:+oo)
5*x+9 = 7*x+29 // - 7*x+29
5*x-(7*x)-29+9 = 0
5*x-7*x-29+9 = 0
-2*x-20 = 0 // + 20
-2*x = 20 // : -2
x = 20/(-2)
x = -10
x = -10
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