x - 345 + ( 324 : 4 ) = 109
x - 345 + 81 = 109
x - 345 = 109 - 81
x - 345 = 28
x = 28 + 345
x = 373
x-345+(324:4)=109
x-345+81=109
x=109+345-81
x=373
X-345+(324:4)=109
X-345+81 =109
X-345 =109-81
X-345 =28
X =28+345
X =373
=> x - 345 + 81 = 109
= x - 345 = 109 - 81
x - 345 = 28
x = 28 + 345
x = 273
nha
x-345+81=109
x-345 =109-81
x-345 = 28
x =28+345
x =373
x-345+(324:4)=109
x-345+ 81 =109
x-345=109-81
x-345=28
x =28+345
x =373.