7/12m+2/3m-1/4m=7 помогите пожалуйста!
7/12m+2/3m-1/4m=7 (7/12+2/3-1/4=7/12+8/12-3/12=12/12=1) m=7
7/12m+8/12m-3/12m=7 12/12m=7 m=7