(M-7)(m-9)=0

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Solution for (M-7)(m-9)=0 equation: 



(-7)(M-9)=0

We multiply parentheses ..

(-7M+63)=0

We get rid of parentheses

-7M+63=0

We move all terms containing M to the left, all other terms to the right

-7M=-63

M=-63/-7

M=+9

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