有條數唔識,help!

6 - 3m / 9 + 5 = 7
6 - 3m / 9 = 7 - 5
6 - 3m / 9 = 2
6 - 3m = 2 x 9
6 - 3m = 18
-3m = 18 - 6
-3m = 12
m = 12 / -3
m = -4

希望解答到你 ^^

First X9
(6-3m)/9+5=7
6-3m+45=63
-3m=63-6-45
-3m=12
m=-4

Remember to put the (-) to the right side

6-3m = (7-5)*9
6-3m = 18
-3m = 18-6
m = 12/(-3)
m = (-4)

(6-3m)/9+5=7
6-3m+45=63 (兩邊乘9)
-3m=12 (簡化)
m=-4 (兩邊除以-3)

[(6-3m) / 9] + 5 = 7
[(6-3m) / 9] = 2
6-3m = 18
6-18 = 3m
-12 = 3m
m = -4

6-3m/9+5=7
6-3m/9=7-5
6-3m/9=2
6-3m=2*9
6-3m=18
6=18+3m
6-18=3m
-12=3m
-4=m
m= -4