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z-13=5.5
We simplify the equation to the form, which is simple to understand
z-13=5.5
We move all terms containing z to the left and all other terms to the right.
+1z=+5.5+13
We simplify left and right side of the equation.
+1z=+18.5
We divide both sides of the equation by 1 to get z.
z=18.5
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