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x in (-oo:+oo)
5-4*x-(4*x) = 53 // - 53
5-4*x-(4*x)-53 = 0
5-4*x-4*x-53 = 0
-8*x-48 = 0 // + 48
-8*x = 48 // : -8
x = 48/(-8)
x = -6
x = -6
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