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10 + 2(x - 1) + 7 x 3x + 1 =10 + 2x - 2 + (7 x 3x) + 1 =

10 + 2x - 2 + 21x + 1 =

2x + 21x + 10 - 2 + 1 =

23x + 9

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7y ago

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