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-4+2z=-3
We simplify the equation to the form, which is simple to understand
-4+2z=-3
We move all terms containing z to the left and all other terms to the right.
+2z=-3+4
We simplify left and right side of the equation.
+2z=+1
We divide both sides of the equation by 2 to get z.
z=0.5
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