-4=-.4z

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Solution for -4=-.4z equation:


Simplifying
-4 = -0.4z

Solving
-4 = -0.4z

Solving for variable 'z'.

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

Add '0.4z' to each side of the equation.
-4 + 0.4z = -0.4z + 0.4z

Combine like terms: -0.4z + 0.4z = 0.0
-4 + 0.4z = 0.0

Add '4' to each side of the equation.
-4 + 4 + 0.4z = 0.0 + 4

Combine like terms: -4 + 4 = 0
0 + 0.4z = 0.0 + 4
0.4z = 0.0 + 4

Combine like terms: 0.0 + 4 = 4
0.4z = 4

Divide each side by '0.4'.
z = 10

Simplifying
z = 10

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