Solve for m
m=-\frac{21}{40}=-0.525
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20\times 2m-15\times 8m-30=12
Multiply both sides of the equation by 60, the least common multiple of 3,4,2,5.
40m-15\times 8m-30=12
Multiply 20 and 2 to get 40.
40m-120m-30=12
Multiply -15 and 8 to get -120.
-80m-30=12
Combine 40m and -120m to get -80m.
-80m=12+30
Add 30 to both sides.
-80m=42
Add 12 and 30 to get 42.
m=\frac{42}{-80}
Divide both sides by -80.
m=-\frac{21}{40}
Reduce the fraction \frac{42}{-80} to lowest terms by extracting and canceling out 2.
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