Solve for M
M=-\frac{77}{324}\approx -0.237654321
Assign M
M≔-\frac{77}{324}
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M=\frac{4}{324}-\frac{81}{324}
Least common multiple of 81 and 4 is 324. Convert \frac{1}{81} and \frac{1}{4} to fractions with denominator 324.
M=\frac{4-81}{324}
Since \frac{4}{324} and \frac{81}{324} have the same denominator, subtract them by subtracting their numerators.
M=-\frac{77}{324}
Subtract 81 from 4 to get -77.
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