7z-7z-7z+7z=

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Solution for 7z-7z-7z+7z= equation:


7z-7z-7z+7z=0

We simplify the equation to the form, which is simple to understand 
7z-7z-7z+7z=0

We move all terms containing z to the left and all other terms to the right. 
+7z-7z-7z+7z=0

We simplify left and right side of the equation. 
z=0

0=0

This equation is an identity, so all real numbers are solutions.

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