0.42=-.5z

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Solution for 0.42=-.5z equation:


Simplifying
0.42 = -0.5z

Solving
0.42 = -0.5z

Solving for variable 'z'.

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

Add '0.5z' to each side of the equation.
0.42 + 0.5z = -0.5z + 0.5z

Combine like terms: -0.5z + 0.5z = 0.0
0.42 + 0.5z = 0.0

Add '-0.42' to each side of the equation.
0.42 + -0.42 + 0.5z = 0.0 + -0.42

Combine like terms: 0.42 + -0.42 = 0.00
0.00 + 0.5z = 0.0 + -0.42
0.5z = 0.0 + -0.42

Combine like terms: 0.0 + -0.42 = -0.42
0.5z = -0.42

Divide each side by '0.5'.
z = -0.84

Simplifying
z = -0.84

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