`= 3 - 7/5 + 33/10 - ( 12/30 - 25/30 ) + 4/15 - 4/3 `
` = 3/1 - 14/10 + 33/10 - ( (12 - 30 ) / 30 ) + 4/15 - 20/15 `
` = 30/10 - 14/10 + 33/10 - -3/5 + 4/15 - 20/15 `
` = 16/10 + 33/10 - -3/5 + 4/15 - 20/15 `
` = 46/10 - -3/5 + 4/15 - 20/15 `
` = 26/5 + 4/15 - 20/15 `
` = 78/15 + 4/15 - 20/15 `
` = ( 78 + 4 - 20 ) / 15 `
` = 64/15 `