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-3z+8+(-12z)=-12
We simplify the equation to the form, which is simple to understand
-3z+8+(-12z)=-12
Remove unnecessary parentheses
-3z+8-12z=-12
We move all terms containing z to the left and all other terms to the right.
-3z-12z=-12-8
We simplify left and right side of the equation.
-15z=-20
We divide both sides of the equation by -15 to get z.
z=1.33333333333
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