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-5z+2(z-30)=0
We simplify the equation to the form, which is simple to understand
-5z+2(z-30)=0
Reorder the terms in parentheses
-5z+(+2z-60)=0
Remove unnecessary parentheses
-5z+2z-60=0
We move all terms containing z to the left and all other terms to the right.
-5z+2z=0+60
We simplify left and right side of the equation.
-3z=+60
We divide both sides of the equation by -3 to get z.
z=-20
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