13.
P.S: Use a calculator or google calculator. Just write the question down with pluses (+) or minuses (-) and for divided just write divided it will be much easier than using this. If it's for school use paper.
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This cannot be solved. If you have 2 unknowns (a,b) then you must have 2 equations.
10^2 minus 4 times 8 divided by 8 plus 9 is equal to 105.
90/5 = 1818/2 = 9
3 divided by 4 plus 1 divided by 2 minus 2 divided by 3