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-131-12z=-z+89
We simplify the equation to the form, which is simple to understand
-131-12z=-z+89
We move all terms containing z to the left and all other terms to the right.
-12z+1z=+89+131
We simplify left and right side of the equation.
-11z=+220
We divide both sides of the equation by -11 to get z.
z=-20
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