ta có : 7962-136-x=1428
=>7800- x = 1428
=> x = 7800-1428
x = 6372
Vậy x = 6372
\(7963-136-x=1428\)
\(136-x=7963-1428\)
\(136-x=6535\)
\(x=136-6535\)
\(x=-6399\)
7963 - 136 - x = 1428
\(\Rightarrow\)7827-x=1428
\(\Rightarrow\)x = 7827 - 1428 = 6399
Vậy x = 6399
Hk tốt!