X + 3( X - 7 ) = 2X + 8
X + 3X - 21 = 2X + 8
4X - 21 = 2X + 8
4X - 2X = 8 + 21
2X = 29
X = 29/2
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X + 3( X - 7 ) = 2X + 8
X + 3X - 21 = 2X + 8
4X - 21 = 2X + 8
4X - 2X = 8 + 21
2X = 29
X = 29/2