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4z-15=-8z-27
We simplify the equation to the form, which is simple to understand
4z-15=-8z-27
We move all terms containing z to the left and all other terms to the right.
+4z+8z=-27+15
We simplify left and right side of the equation.
+12z=-12
We divide both sides of the equation by 12 to get z.
z=-1
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