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-40=2z+20
We simplify the equation to the form, which is simple to understand
-40=2z+20
We move all terms containing z to the left and all other terms to the right.
-2z=+20+40
We simplify left and right side of the equation.
-2z=+60
We divide both sides of the equation by -02 to get z.
z=-30
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