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5=z/4.2
We simplify the equation to the form, which is simple to understand
5=z/4.2
We move all terms containing z to the left and all other terms to the right.
-0.23809523809524z=-5
We simplify left and right side of the equation.
-0.23809523809524z=-5
We divide both sides of the equation by -00.23809523809524 to get z.
z=21
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