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2z+9.57-7z=-5.15
We simplify the equation to the form, which is simple to understand
2z+9.57-7z=-5.15
We move all terms containing z to the left and all other terms to the right.
+2z-7z=-5.15-9.57
We simplify left and right side of the equation.
-5z=-14.72
We divide both sides of the equation by -5 to get z.
z=2.944
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