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Explanation of binomial solving

Please explain this equation? This was in my text book and I am having a hard time understanding this. How do you arrive to this answer

x+16-16=12 -16
x= -4

Solution Preview

First of all, an equation is like a balance, when you add or subtract same amount on both sides of a balance, the balance is still balanced. So is true for an equation: ...

Solution Summary

This looks at the solution of an equation and explains the steps.