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-z-20=-11z-15z-20
We simplify the equation to the form, which is simple to understand
-z-20=-11z-15z-20
We move all terms containing z to the left and all other terms to the right.
-1z+11z+15z=-20+20
We simplify left and right side of the equation.
+25z=0
We divide both sides of the equation by 25 to get z.
z=0
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