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=>3X + 6 = 9X - 30 ( X = 6 )
=>2X - 6 = 3X -14 ( X =8 )
=>7X - 13 + X = 3X - 3 + 4X ( X = 10)
=>2X - 24 - 4X = 2X -12 - 5X ( X = 12 )