198-(x+4)=120
=>x+4=198-120
=>x+4=78
=>x=78-4
=>x=74
198-(X+4)=120
X+4 =198-120
X+4 =78
X =78-4
X =74
Vậy X=74.
198 - ( x + 4 ) = 120
x + 4 = 198 - 120
x + 4 = 78
x = 78 - 4
x = 74
198 - (x + 4) = 120
=> x + 4 = 198 - 120
=> x + 4 = 78
=> x = 78 - 4
=> x = 74