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2x + 7 + 5x - 4 - x = (2x + 5x - x) + (7 - 4) = 6x + 3
5x-4=8+2x 5x-2x=4+8 3x=12 x=12/3 x=4
5x+2=2x-10 x=-4
5x-2x = 3
5x - 2x = 3x