The answer is 9.6. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.
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-9
2x + 7 + 2x = 23 4x + 7 = 23 4x = 16 x = 16/4 x = 4
23 + 5u = 17Subtract 17 23 from both sides:5u = -6Divide both sides by 5:u = -6/5
16 + 23 + 14 = 53
24 + 23 + 22 + 21 + 20 + 19 + 18 + 17 + 16 + 15 + 14 + 13 + 12 + 11 + 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 300