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x in (-oo:+oo)
1-(4*x)-(5*x) = -53 // + 53
1-(4*x)-(5*x)+53 = 0
1-4*x-5*x+53 = 0
54-9*x = 0 // - 54
-9*x = -54 // : -9
x = -54/(-9)
x = 6
x = 6
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