Question

[(26-m)*9:3]+108*7=900-84

Answer 1

[(26-m)*9:3]+756=816
[(26-m)*9:3]=816-756
(26-m)*9:3=60
(26-m)*9=60*3
(26-m)*9=180
26-m=180:9
26-m=20
m=26-20
m=6

Answer 2

[(26-m)*9:3]+108*7=900-84
[(26-m)*3]+756=816
(26-m)*3=816-756
(26-m)*3=60
26-m=60:3=20
-m=20-26=-6 *(-1)
m=6
V: [(26-6)*9:3]+108*7=900-84
(20*9:3)+756=816
180:3+756=816
60+756=816
816=816