3x + 7 = 37: subtract 7 on both sides, divide by 3 on both sides , x = 10, 7x + 3 = 52: subtract 3 on both sides , divide by 7 on both sides , x = 7, -2 + 4x = 14: add 2 to both sides, divide by 4 on both sides, x = 4, 2x - 4 = 20: add 4 to both sides , divide by 2 on both sides, x = 12,

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