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-4z-3=9z-42
We simplify the equation to the form, which is simple to understand
-4z-3=9z-42
We move all terms containing z to the left and all other terms to the right.
-4z-9z=-42+3
We simplify left and right side of the equation.
-13z=-39
We divide both sides of the equation by -13 to get z.
z=3
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