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x in (-oo:+oo)
68 = 6*x+3*x+5 // - 6*x+3*x+5
68-(6*x)-(3*x)-5 = 0
68-6*x-3*x-5 = 0
63-9*x = 0 // - 63
-9*x = -63 // : -9
x = -63/(-9)
x = 7
x = 7
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