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4n + 5 = 21n - 97

n = 3

2n + 3n = 1050

8n - 4 = 2n + 596

n = 100

200 + 8n = (n-10)² + 40

5(7 + n) = 850/n

n = 441

n = 210

n! = 2n

n = 7

n = 1

n = 6

n = 10

n = 30

(√n)/3 = n - 434

n² - 9 = n(40/n)

125(n/5) = 25n