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x in (-oo:+oo)
5-3*x-(3*x) = -55 // + 55
5-3*x-(3*x)+55 = 0
5-3*x-3*x+55 = 0
60-6*x = 0 // - 60
-6*x = -60 // : -6
x = -60/(-6)
x = 10
x = 10
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