6z+7z=15

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Solution for 6z+7z=15 equation: 


Simplifying
6z + 7z = 15

Combine like terms: 6z + 7z = 13z
13z = 15

Solving
13z = 15

Solving for variable 'z'.

Move all terms containing z to the left, all other terms to the right.

Divide each side by '13'.
z = 1.153846154

Simplifying
z = 1.153846154

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