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-15=2.05z-2
We simplify the equation to the form, which is simple to understand
-15=2.05z-2
We move all terms containing z to the left and all other terms to the right.
-2.05z=-2+15
We simplify left and right side of the equation.
-2.05z=+13
We divide both sides of the equation by -02.05 to get z.
z=-6.34146341463
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