7*9 = 9*(10 - 3)
= 90 - 27
= 63
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you would go: (30x9) + (7x9) = 270 + 63 = 333 which is the same as if you typed 37x9 into the calculator and got 333!
-304
trial and error; 5x7=35 9x9=82, difference of 47. not big enough difference. 7x9=63 11x11=121. differenence of 58, which is too big. sorry, but this means there is not answer.
Expressions within parenthases (brackets) should be done first. Then each operation should be done in turn from left to right. Therefore 4+7x(5+4) would be 4+7x9 and then 11x9 =99.