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7-3z/7z=-2
We simplify the equation to the form, which is simple to understand
7-3z/7z=-2
We move all terms containing z to the left and all other terms to the right.
0=-2-7 + 0.42857142857143
We simplify left and right side of the equation.
0=-8.5714285714286
0=-8.5714285714286
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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