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4z-9-2z+5=0
We simplify the equation to the form, which is simple to understand
4z-9-2z+5=0
We move all terms containing z to the left and all other terms to the right.
+4z-2z=0+9-5
We simplify left and right side of the equation.
+2z=+4
We divide both sides of the equation by 2 to get z.
z=2
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