We start with
1=850-4-3 as the cotton swab equation, incorrect of course.
By moving 3 swabs or less create a correct equation. It is a standard digital display. You may use numbers, roman numerals or letters in standard digital display. If you use roman numerals, 1 willl have 2 swabs, C will have 4, D will have 6, L will have 3, V and X will have 4, M will have 6. No inequalities or > or <. No significant space creation to insert swabs. Rearranging is a move. No Removing or adding swabs. Use any math functions. Minus and Divide use 1 swab. Plus and multiply and equal to use 2 swabs.