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X - 4 = 9 add 4 to each side X = 13 check 13 - 4 = 9 9 = 9
The formula is 9 : 100 4 : x x = 4 * 100 / 9 x= 400 / 9 x= 44.4444444444
10 x 4 x -9 =40 x -9 =-360
8 is twice as big as 4. 9 x 8 is twice as big as 9 x 4.
349 = (3 x 100) + (4 x 10) + (9 x 1)