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2/z-1+2/5=4/z-1
We simplify the equation to the form, which is simple to understand
2/z-1+2/5=4/z-1
We move all terms containing z to the left and all other terms to the right.
+1z-1z=-1+1-0.4
We simplify left and right side of the equation.
z=-0.4
0=-0.4
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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