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11z=20-9z
We simplify the equation to the form, which is simple to understand
11z=20-9z
We move all terms containing z to the left and all other terms to the right.
+11z+9z=+20
We simplify left and right side of the equation.
+20z=+20
We divide both sides of the equation by 20 to get z.
z=1
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