`\color {blue} \text {_Namm_}`
`16, x+5/12=-1 2/7`
`x=-1 2/7-5/12`
`x=-143/84`
`17, 4 1/2x \div 5/12=0,5`
`4 1/2x=0,5*5/12`
`4 1/2x=5/24`
`x=5/24 \div 4 1/2`
`x=5/108`
`18, 7,5*1 3/4x=6 2/5`
`105/8x=6 2/5`
`x=6 2/5 \div 105/8`
`x=256/525`
`19, 3 1/2+2x=5 1/3 \div 2 2/3`
`3 1/2+2x=2`
`2x=2-3 1/2`
`2x=-3/2`
`x=-3/2 \div 2`
`x=-3/4`
`20, (4 1/3+3x)*2 3/5=2/3-5`
`(4 1/3+3x)*2 3/5=-13/3`
`4 1/3+3x=-13/3 \div 2 3/5`
`4 1/3+3x=-5/3`
`3x=(-5/3)-4 1/3`
`3x=-6`
`x=(-6) \div 3`
`x=2`
16: x=-9/7-5/12=-143/84
17: =>9/2x=1/2*5/12=5/24
=>x=5/108
18: =>105/8*x=6,4
=>x=525/256
19: =>2x+7/2=2
=>2x=-3/2
=>x=-3/4
20: =>(3x+13/3)*8/3=-13/3
=>3x+13/3=-21/3=-7
=>3x=-7-13/3=-34/3
=>x=-34/9
