-4(20-5z)=40

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Solution for -4(20-5z)=40 equation: 


Simplifying
-4(20 + -5z) = 40
(20 * -4 + -5z * -4) = 40
(-80 + 20z) = 40

Solving
-80 + 20z = 40

Solving for variable 'z'.

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

Add '80' to each side of the equation.
-80 + 80 + 20z = 40 + 80

Combine like terms: -80 + 80 = 0
0 + 20z = 40 + 80
20z = 40 + 80

Combine like terms: 40 + 80 = 120
20z = 120

Divide each side by '20'.
z = 6

Simplifying
z = 6

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