a) `450:(x-19)=50`
`=> x-19=9`
`=> x=19+9`
`=> x=28`
b) `7x-2x=6^2+44:11`
`=> 5x=36+4`
`=> 5x=40`
`=> x=40:5`
`=> x=8`
a: =>x-19=9
hay x=28
b: =>5x=36+4=40
=>x=8
a) 450 : (x-19) = 50
x-19 = 450 : 50
x-19 = 9
x = 9 + 19
x = 28
b) 7x - 2x = 62 + 44 : 11
7x - 2x = 36 + 44 : 11
7x - 2x = 36 + 4
7x - 2x = 40
x. (7- 2) = 40
x. 5 =40
x. =40 : 5
x. =8
