Solve for M
M=20
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3M=4\times 15
Multiply both sides of the equation by 36, the least common multiple of 12,9.
3M=60
Multiply 4 and 15 to get 60.
M=\frac{60}{3}
Divide both sides by 3.
M=20
Divide 60 by 3 to get 20.
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