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7x2
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7xsquare = 7 x square = 1 x = +1 or -1
7x-2
8x=7x-7 x=-7
12x - 4 = 7x - 21 12x -7x = -21 + 4 5x = -17 x = -3.4
7x+8-x-7 6x+1