x = 7 - x + 5 = 12 , x = 4 - 5x - 4 = 2x + 8 , x = 5 - 10x - 20 = 4x + 10 , x = 3 - 7 + 3x = 1 + 5x , x = - 5 - 2(x + 4) = 4x + 18,

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