(Q-4)(q-7)=0

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Solution for (Q-4)(q-7)=0 equation: 



(-4)(Q-7)=0

We multiply parentheses ..

(-4Q+28)=0

We get rid of parentheses

-4Q+28=0

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

-4Q=-28

Q=-28/-4

Q=+7

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