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7\left(8m+6\right)+84=2\left(10m+5\right)
Multiply both sides of the equation by 14, the least common multiple of 2,7.
56m+42+84=2\left(10m+5\right)
Use the distributive property to multiply 7 by 8m+6.
56m+126=2\left(10m+5\right)
Add 42 and 84 to get 126.
56m+126=20m+10
Use the distributive property to multiply 2 by 10m+5.
56m+126-20m=10
Subtract 20m from both sides.
36m+126=10
Combine 56m and -20m to get 36m.
36m=10-126
Subtract 126 from both sides.
36m=-116
Subtract 126 from 10 to get -116.
m=\frac{-116}{36}
Divide both sides by 36.
m=-\frac{29}{9}
Reduce the fraction \frac{-116}{36} to lowest terms by extracting and canceling out 4.