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51157
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51157
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450+\frac{390+1}{1}\times 130-123
Multiply 390 and 1 to get 390.
450+\frac{391}{1}\times 130-123
Add 390 and 1 to get 391.
450+391\times 130-123
Anything divided by one gives itself.
450+50830-123
Multiply 391 and 130 to get 50830.
51280-123
Add 450 and 50830 to get 51280.
51157
Subtract 123 from 51280 to get 51157.
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