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Anonymous
x + 2x + 423 = 3x + 423
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6x with 3 over the x, because that is how many x's there are.
X=7
x plus 2 = x + 2 x plus x = 2x
5x + x - 6x + 2x = 2x
-7 +2x = x + 8 2x - x = 7 + 8 x = 15