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-0.8=z+7.7
We simplify the equation to the form, which is simple to understand
-0.8=z+7.7
We move all terms containing z to the left and all other terms to the right.
-1z=+7.7 + 0.8
We simplify left and right side of the equation.
-1z=+8.5
We divide both sides of the equation by -01 to get z.
z=-8.5
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