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If the number is A then

3A + 10(A + 4) = 170

3A + 10A + 40 = 170

13A + 40 = 170

13A = 170 - 40 = 130

13A/13 = 130/13

A = 10

Check: 30 + 10(10 + 4) = 30 + 100 + 40 = 170

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9y ago

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