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12z+4=+15z-11
We simplify the equation to the form, which is simple to understand
12z+4=+15z-11
We move all terms containing z to the left and all other terms to the right.
+12z-15z=-11-4
We simplify left and right side of the equation.
-3z=-15
We divide both sides of the equation by -3 to get z.
z=5
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