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4z-12=z+15
We simplify the equation to the form, which is simple to understand
4z-12=z+15
We move all terms containing z to the left and all other terms to the right.
+4z-1z=+15+12
We simplify left and right side of the equation.
+3z=+27
We divide both sides of the equation by 3 to get z.
z=9
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