6m(7-m)=36-2m(3m-15),则m=？

42m-6m^2=36-6m^2+30m
12m=36
m=3

两边相乘后m^2消去，只留下m项和常数项，即维42m=36+30m
m=3

6m(7-m)=42m-6m2
36-2m(3m-15)=36-6m2+30m
因为6m(7-m)=36-2m(3m-15)
则42m-6m2=36-6m2+30m
即42m=36+30m
m=3

6m(7-m)=36-2m(3m-15)
2m(21-3m)=36-2m(3m-15)
2m(21-3m+3m-15)=36
2m*6=36
12m=36
m=3

6m(7-m)=36-2m(3m-15)
42m-6m²=36-6m²+30m
12m=36
m=3

6m(7-m)=36-2m(3m-15),
6m(7-m)+6m(m-5)=36
6m(7-m+m-5)=36
m=3