-7z-(-4z)=15

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Solution for -7z-(-4z)=15 equation: 


Simplifying
-7z + -1(-4z) = 15

Remove parenthesis around (-4z)
-7z + -1 * -4z = 15

Multiply -1 * -4
-7z + 4z = 15

Combine like terms: -7z + 4z = -3z
-3z = 15

Solving
-3z = 15

Solving for variable 'z'.

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

Divide each side by '-3'.
z = -5

Simplifying
z = -5

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