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.20z-1=-3
We simplify the equation to the form, which is simple to understand
.20z-1=-3
We move all terms containing z to the left and all other terms to the right.
+ 0.2z=-3+1
We simplify left and right side of the equation.
+ 0.2z=-2
We divide both sides of the equation by 0.2 to get z.
z=-10
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