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To get 5 using the numbers 19, 2, 6, and 3, you can subtract 6 from 19 to get 13, then subtract 3 from 13 to get 10, and finally subtract 2 from 10 to get 8. So, you cannot get 5 using these specific numbers.
Subtract a negative 1. 19 - (-1) = 20
24/30 - 5/30 = 19/30
4a + 1 - a =19, rewrite your question, 4a + -a + 1 =19, 3a + 1 =19, subtract 1 from each side 3a = 18, divide by 3, a =6
5h + 6 = 25 Subtract 6 from both sides: 5h = 19 Divide both sides by 5: h = 3.8 h = 3.8