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Solve for M
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Solve for m
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90-10m-9M+Mm=12
Use the distributive property to multiply 10-M by 9-m.
-10m-9M+Mm=12-90
Subtract 90 from both sides.
-10m-9M+Mm=-78
Subtract 90 from 12 to get -78.
-9M+Mm=-78+10m
Add 10m to both sides.
\left(-9+m\right)M=-78+10m
Combine all terms containing M.
\left(m-9\right)M=10m-78
The equation is in standard form.
\frac{\left(m-9\right)M}{m-9}=\frac{10m-78}{m-9}
Divide both sides by m-9.
M=\frac{10m-78}{m-9}
Dividing by m-9 undoes the multiplication by m-9.
M=\frac{2\left(5m-39\right)}{m-9}
Divide -78+10m by m-9.
90-10m-9M+Mm=12
Use the distributive property to multiply 10-M by 9-m.
-10m-9M+Mm=12-90
Subtract 90 from both sides.
-10m-9M+Mm=-78
Subtract 90 from 12 to get -78.
-10m+Mm=-78+9M
Add 9M to both sides.
\left(-10+M\right)m=-78+9M
Combine all terms containing m.
\left(M-10\right)m=9M-78
The equation is in standard form.
\frac{\left(M-10\right)m}{M-10}=\frac{9M-78}{M-10}
Divide both sides by M-10.
m=\frac{9M-78}{M-10}
Dividing by M-10 undoes the multiplication by M-10.
m=\frac{3\left(3M-26\right)}{M-10}
Divide -78+9M by M-10.