6.4(2.1z+4.2)=8.5

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Solution for 6.4(2.1z+4.2)=8.5 equation: 


Simplifying
6.4(2.1z + 4.2) = 8.5

Reorder the terms:
6.4(4.2 + 2.1z) = 8.5
(4.2 * 6.4 + 2.1z * 6.4) = 8.5
(26.88 + 13.44z) = 8.5

Solving
26.88 + 13.44z = 8.5

Solving for variable 'z'.

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

Add '-26.88' to each side of the equation.
26.88 + -26.88 + 13.44z = 8.5 + -26.88

Combine like terms: 26.88 + -26.88 = 0.00
0.00 + 13.44z = 8.5 + -26.88
13.44z = 8.5 + -26.88

Combine like terms: 8.5 + -26.88 = -18.38
13.44z = -18.38

Divide each side by '13.44'.
z = -1.367559524

Simplifying
z = -1.367559524

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