( 3x - 21 ) : 4 + 108 = 114
=> ( 3x - 21 ) : 4 = 114 - 108
=> ( 3x - 21 ) : 4 = 6
=> 3x - 21 = 6 x 4
=> 3x - 21 = 24
=> 3x = 24 + 21
=> 3x = 45
=> x = 45 : 3
=> x = 15
(3x-21):4+108=114
<=>(3x-21):4=6
<=>3x-21=24
<=>3x=45
<=>x=15
(3x-21):4+108=114
<=>(3x-21):4=6
<=>3x-21=24
<=>3x=45
<=>x=15