`a ) 18,1 - 723,6 : x = 5,6`
`723,6 : x = 18,1 - 5,6`
`723,6 : x = 12,5`
`x = 723,6 : 12,5`
`x = 57,888`
`b ) ( 17,82 - x ) : 0,7 = 12,8`
`17,82 - x = 12,8 × 0,7`
`17,82 - x = 8,96`
`x = 17,82 - 8,96`
`x = 8,86`
`c ) 128,4 - ( 5,2 + x ) × 1/2 = 34,26`
`128,4 - ( 5,2 + x ) = 34,26 : 1/2`
`128,4 - ( 5,2 + x ) = 68,52`
`5,2 + x = 128,4 - 68,52`
`5,2 + x = 59,88`
`x = 59,88 - 5,2`
`x = 54,68`
`d ) {x + 0,85}/14 = 3/4`
`{x + 0,85}/14 = 10,5/14`
`x + 0,85 = 10,5`
`x = 10,5 - 0,85`
`x = 9,65`
`đ ) {4,8 - x}/3 = 5/6`
`{4,8 - x}/3 = 2,5/3`
`4,8 - x = 2,5`
`x = 4,8 - 2,5`
`x = 2,3`
`e ) x + 2,5 + 3,6 × x = 18,849`
`x × 1 + 3,6 × x = 18,849 - 2,5`
`x × ( 1 + 3,6 ) = 16,349`
`x × 4,6 = 16,349`
`x = 16,349 : 4,6`
`x = 3,55..`
`ê ) 5/4 × x + 1/2 × x + x = 4 1/8`
`5/4 × x + 1/2 × x + x × 1 = 33/8`
`( 5/4 + 1/2 + 1 ) × x = 33/8`
`11/4 × x = 33/8`
`x = 33/8 : 11/4`
`x = 33/22`
`g ) 15,6 × x - 8,63 × x = 3,485`
`( 15,6 - 8,63 ) × x = 3,485`
`6,97 × x = 3,485`
`x = 6,97 : 3,485`
`x = 2`
`#dtkc`
