$8T=9M+312$
Move the variable to the left-hand side and change its sign$8T-9M=312$
Move the variable to the right-hand side and change its sign$-9M=312-8T$
Divide both sides of the equation by $-9$$M=-\frac{ 104 }{ 3 }+\frac{ 8 }{ 9 }T$
Use the commutative property to reorder the terms$M=\frac{ 8 }{ 9 }T-\frac{ 104 }{ 3 }$