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(3/4)n + 20 = 65 (multiply by 4 each element in both sides)
3n + 80 = 260 (subtract 80 to both sides)
3n = 180 (divide both sides by 3)
n = 60

Or

(3/4)n + 20 = 65 (subtract 20 to both sides)
(3/4)n = 45 (multiply both sides by 4/3)
n = 60

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Q: Three-fourhts of a number increased by 20 is 65 find the number?
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