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x in (-oo:+oo)
x-4 = 6*x+36 // - 6*x+36
x-(6*x)-36-4 = 0
x-6*x-36-4 = 0
-5*x-40 = 0 // + 40
-5*x = 40 // : -5
x = 40/(-5)
x = -8
x = -8
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