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3z-12=-5
We simplify the equation to the form, which is simple to understand
3z-12=-5
We move all terms containing z to the left and all other terms to the right.
+3z=-5+12
We simplify left and right side of the equation.
+3z=+7
We divide both sides of the equation by 3 to get z.
z=2.33333333333
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