3(x+16)=21+351
3(x+16)= 372
x + 16 = 372 : 3
x + 16 = 124
x = 124 - 16
x = 108
3(x + 16 ) = 21 + 351
3(x + 16) = 372
(x + 16) = 372 : 3
(x + 16 ) = 124
x = 124 - 6
x = 118
chuk bạn hoccj tốt
3(x+16)=21+351
3(x+16)=372
x+16=372:3
x+16=124
x=124-16
x=108
Vậy x=108
3(x+16)=372
x+16=372/3
x+16=124
x=124-16
x=108