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12m-2\left(5m-1\right)+3\left(7-m\right)=30
Multiply both sides of the equation by 6, the least common multiple of 3,2.
12m-10m+2+3\left(7-m\right)=30
Use the distributive property to multiply -2 by 5m-1.
2m+2+3\left(7-m\right)=30
Combine 12m and -10m to get 2m.
2m+2+21-3m=30
Use the distributive property to multiply 3 by 7-m.
2m+23-3m=30
Add 2 and 21 to get 23.
-m+23=30
Combine 2m and -3m to get -m.
-m=30-23
Subtract 23 from both sides.
-m=7
Subtract 23 from 30 to get 7.
m=-7
Multiply both sides by -1.