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19=4z-13.8
We simplify the equation to the form, which is simple to understand
19=4z-13.8
We move all terms containing z to the left and all other terms to the right.
-4z=-13.8-19
We simplify left and right side of the equation.
-4z=-32.8
We divide both sides of the equation by -04 to get z.
z=8.2
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