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-15z-12z+10z-2z+9z=-14
We simplify the equation to the form, which is simple to understand
-15z-12z+10z-2z+9z=-14
We move all terms containing z to the left and all other terms to the right.
-15z-12z+10z-2z+9z=-14
We simplify left and right side of the equation.
-10z=-14
We divide both sides of the equation by -10 to get z.
z=1.4
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