`a)`
`123-5(x+4)=38`
`=> 5(x+4)=123-38`
`=> 5(x+4)= 85`
`=>x+4=85:5`
`=>x+4= 17`
`=>x=17-4`
`=>x= 13`
`b)`
`[213-(x-6) ] .13=1339``=> 213-(x-6) =1339:13`
`=> 213-(x-6) = 103`
`=>x-6=213-103`
`=>x-6= 110`
`=>x=110+6`
`=>x=116`
`c)`
`[(6x-36):7 ] .4=12``=>(6x-36):7=12:4`
`=>(6x-36):7=3`
`=>6x-36=3.7`
`=>6x-36=21`
`=>6x=21+36`
`=>6x= 57`
`=>x= 57:6`
`=>x=57/6`
<=>-5x-20+123=38
<=>-5x=-65
<=>x=13
b)<=>2769-13x+78=1339
<=>-13x=-1508
=>x=116
c)<=>\(\left(\dfrac{6x}{7}-\dfrac{36}{7}\right).4=12< =>\dfrac{24x}{7}-\dfrac{144}{7}=12\)
<=>24x-144=84
<=>228=24x
=>x=9.5
d) 123 - 5 . ( x + 4 ) = 38
5 . ( x + 4 ) = 123 - 38
5 . ( x + 4 ) = 85
x + 4 = 85 : 5
x + 4 = 17
x = 17 - 4
x = 13
e) [ 213 - ( x - 6 ) ] . 13 = 1339
213 - ( x - 6 ) = 1339 : 13
213 - ( x - 6 ) = 103
x - 6 = 213 - 103
x - 6 = 110
x = 110 + 6
x = 116
f) [ ( 6 . x - 36 ) : 7 ] . 4 = 12
( 6 . x - 36 ) : 7 = 12 : 4
( 6 . x - 36 ) : 7 = 3
6 . x - 36 = 3 x 7
6 . x - 36 = 21
6 . x = 21 + 36
6 . x = 57
x = 57 : 6
x = 9,5
