x + 167 + 628 -172 = 4784
x + 795 = 4784 +172
x + 795 = 4956
x = 4956 - 795 (TSH)
x = 4161
x+167+628-172=4784
x+(167+628-172)=4784
x+623=4784
x=4784-623
x=4161
Vậy x=4161
x+167+628 - 172 = 4784
x+167+628 = 4784+172
x+167+628 = 4956
x+167 = 4956 - 628
x+167 = 4328
x = 4328 - 167
x = 4161
x + 167 + 628 - 172 = 4784
x + 167 + 628 = 4784 + 172
x + 167 + 628 = 4956
x + 167 = 4956 - 628
x + 167 = 4328
x = 4328 - 167
x = 4161
x + 167 + 628 - 172 = 4784
x + 167 + 628 = 4784 + 172
x + 167 + 628 = 4956
x + 167 = 4956 - 628
x + 167 = 4328
x = 4328 - 167
x = 4161
x+167+628-172=4784
x+(167+628-172)=4784
x+ 623 =4784
x =4784-623
x =6161
mình nhầm
x+167+628-172=4784
x+(167+628-172)=4784
x+ 623 =4784
x =4784-623
x =4161
x + 167 + 628 - 172 = 4784
x + 623 = 4784
x = 4784 - 623
x = 4161