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7\left(m-10\right)-3\left(6m-19\right)=42
Multiply both sides of the equation by 21, the least common multiple of 3,7.
7m-70-3\left(6m-19\right)=42
Use the distributive property to multiply 7 by m-10.
7m-70-18m+57=42
Use the distributive property to multiply -3 by 6m-19.
-11m-70+57=42
Combine 7m and -18m to get -11m.
-11m-13=42
Add -70 and 57 to get -13.
-11m=42+13
Add 13 to both sides.
-11m=55
Add 42 and 13 to get 55.
m=\frac{55}{-11}
Divide both sides by -11.
m=-5
Divide 55 by -11 to get -5.