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-20+2z=20-18z
We simplify the equation to the form, which is simple to understand
-20+2z=20-18z
We move all terms containing z to the left and all other terms to the right.
+2z+18z=+20+20
We simplify left and right side of the equation.
+20z=+40
We divide both sides of the equation by 20 to get z.
z=2
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