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13+7z=6+7z
We simplify the equation to the form, which is simple to understand
13+7z=6+7z
We move all terms containing z to the left and all other terms to the right.
+7z-7z=+6-13
We simplify left and right side of the equation.
z=-7
0=-7
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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