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x in (-oo:+oo)
x-(6*x)+1 = -29 // + 29
x-(6*x)+1+29 = 0
x-6*x+1+29 = 0
30-5*x = 0 // - 30
-5*x = -30 // : -5
x = -30/(-5)
x = 6
x = 6
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