Răspuns :
Intai scapi de paranteza patrata : (13+12 x m) x 10- 330 = 1300 /+330
(13+ 12 x m) x 10 =1630 /:10
13 + 12 x m = 163 /-13
12 x m =150 /:12
m=12,5
(13+ 12 x m) x 10 =1630 /:10
13 + 12 x m = 163 /-13
12 x m =150 /:12
m=12,5