Subtract 19c from each side: 31 = 7c - 74
Add 74 to each side: 105 = 7c
Divide each side by 7: 15 = c
Check: Does 19 x 15 + 31 = 26 x 15 - 74?
ie 285 + 31 = 390 - 74?
ie 316 = 316? Yes, job done.
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62
31 plus four is 35.
0.98 + 45.102 + 32.3333 + 31 + 0.00009 = 109.41539
Fibonacci numbers
31