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-46 = 3x + 7x
3+3x+7x=13 3x+7x=10 10x=10 x=1
8+7x = 20+3x 7x-3x = 20-8 4x = 12 x = 3
7x = 3x - 12 4x=-12 x=-3
7x - 9 = 3x + 5 7x - 3x - 9 = 5 7x - 3x = 5 + 9 4x = 14 x = 14/4