6x + 7 = 13 + 7x - x = -6, 13 − 4x = 1 − x - x = 4, 7x − 3 = 3 + 6x - x = 6, −3 + 5x = 4x − 10 - x = -7, 4x + 8 = −13 + 7x - x = 7, 1 − x = 16 − 4x - X = 5, x + 3 = −6 + 4x - x = 3, x = 5, x = 2, x = 27.8,

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