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z+z+z+2z=-105
We simplify the equation to the form, which is simple to understand
z+z+z+2z=-105
We move all terms containing z to the left and all other terms to the right.
+1z+1z+1z+2z=-105
We simplify left and right side of the equation.
+5z=-105
We divide both sides of the equation by 5 to get z.
z=-21
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