-7z-(-3z)=-20

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Solution for -7z-(-3z)=-20 equation: 


Simplifying
-7z + -1(-3z) = -20

Remove parenthesis around (-3z)
-7z + -1 * -3z = -20

Multiply -1 * -3
-7z + 3z = -20

Combine like terms: -7z + 3z = -4z
-4z = -20

Solving
-4z = -20

Solving for variable 'z'.

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

Divide each side by '-4'.
z = 5

Simplifying
z = 5

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