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7z-6z+12z=-25
We simplify the equation to the form, which is simple to understand
7z-6z+12z=-25
We move all terms containing z to the left and all other terms to the right.
+7z-6z+12z=-25
We simplify left and right side of the equation.
+13z=-25
We divide both sides of the equation by 13 to get z.
z=-1.92307692308
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