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3*0-4*0-z=0
We simplify the equation to the form, which is simple to understand
3*0-4*0-z=0
We move all terms containing z to the left and all other terms to the right.
-1z=0-3-0+4-0
We simplify left and right side of the equation.
-1z=+1
We divide both sides of the equation by -1 to get z.
z=-1
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