\(d,73-x=89-20\\ 73-x=69\\ x=73-69\\ x=4\\ e,x+7=13+25\\ x+7=38\\ x=38-7\\ x=31\\ f,x+4=198-120\\ x+4=78\\ x=78-4\\ x=74\\ m,x-9=350:5\\ x-9=70\\ x=70+9\\ x=79\\ n,2x-49=45\\ 2x=45+49\\ 2x=94\\ x=47\\ o,2x+6=200-64\\ 2x+6=136\\ 2x=136-6\\ 2x=130\\ x=65\)
d: =>73-x=69
hay x=4
m: =>x-9=70
hay x=79
o: =>2x+6=200-64=136
=>2x=130
hay x=65
f: =>x+4=78
hay x=74
`89-(73-x)=20`
`73-x=89-20`
`73-x=69`
`x=73-69`
`x=4`
Vậy `x=4`
_________________________
`(x+7)-25=13`
`x+7=13+25`
`x+7=38`
`x=38-7`
`x=31`
Vậy `x=31`
_____________________
`198-(x+4)=120`
`x+4=198-120`
`x+4=78`
`x=78-4`
`x=74`
Vậy `x=74`
_________________________
`5.(x-9)=350`
`x-9=350:5`
`x-9=70`
`x=70+9`
`x=79`
Vậy `x=79`
___________________________
`2x-49=5.3^2`
`2x-49=5.9`
`2x-49=45`
`2x=45+49`
`2x=94`
`x=94:2`
`x=47`
Vậy `x=47`
_____________________
`200 - (2x+6)=4^3`
`200-(2x+6)=64`
`2x+6=200-64`
`2x+6=136`
`2x=136-6`
`2x=130`
`x=130:2`
`x=65`
Vậy `x=65`
\(d)89-\left(73-x\right)=20\)
\(73-x=89-20\)
\(73-x=69\)
\(x=73-69\)
\(x=4\)
_______________
\(e)\left(x+7\right)-25=13\)
\(x+7=13+25\)
\(x+7=38\)
\(x=38-7\)
\(x=31\)
_______________________
\(f)198-\left(x+4\right)=120\)
\(x+4=198-120\)
\(x+4=78\)
\(x=78-4\)
\(x=74\)
__________________
\(m)5\left(x-9\right)=350\)
\(x-9=350:5\)
\(x-9=70\)
\(x=70+9\)
\(x=79\)
_____________________
\(n)2x-49=5.3^2\)
\(2x-49=45\)
\(2x=45+49\)
\(2x=94\)
\(x=94:2\)
\(x=47\)
______________
\(o)200-\left(2x+6\right)=4^3\)
\(2x+6=200-64\)
\(2x+6=136\)
\(2x=136-6\)
\(2x=130\)
\(x=130:2\)
\(x=65\)
