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3.9+1.3z=1.3
We simplify the equation to the form, which is simple to understand
3.9+1.3z=1.3
We move all terms containing z to the left and all other terms to the right.
+1.3z=+1.3-3.9
We simplify left and right side of the equation.
+1.3z=-2.6
We divide both sides of the equation by 1.3 to get z.
z=-2
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