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3x+12 - 20-4 4a
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3x + 12 - 2o - 4 4a =
3 + 12 - 20 - 4. 4 =
3 + 12 = 15 - 20 = 5 - 4 4 =1
= 12 + 20+ 4 =37
= 12 - 20 - 4 = 4
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