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6x+x = 7x
8x = 2x + 15 6x = 15 x = 15/6 = 2.5
-6x
6x - 12 = 3x + 15 3x = 27 x = 9
6x + 10 + 4x = 5010x + 10 = 5010x = 40x = 4