x = 18 - x - 7 = 11, x = 42 - x - 13 = 29, x = 2.6 - x + 2.5 = 5.1, x = 14 - x + 13 = 27, x = 3 - 3x = 9 , x = 9 - 8x = 72, x = 28 - x/4 = 7, x = 56 - x/8 = 7, x = 3 1/2 - 1/2 + x = 4, x = 4/7 - 6/7 - x = 2/7, x = 900 - .10x = 90, x = 9,000 - .01x = 90, x = 9.75 - 5.25 + x = 15.00, x = 6.38 - 3.62 + x = 10.00, x = 6.73 - 3.27 + x = 10.00,

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