-5(-4z)=40

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Solution for -5(-4z)=40 equation: 


Simplifying
-5(-4z) = 40

Remove parenthesis around (-4z)
-5 * -4z = 40

Multiply -5 * -4
20z = 40

Solving
20z = 40

Solving for variable 'z'.

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

Divide each side by '20'.
z = 2

Simplifying
z = 2

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