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2(z-20)+3z=0
We simplify the equation to the form, which is simple to understand
2(z-20)+3z=0
Reorder the terms in parentheses
+(+2z-40)+3z=0
Remove unnecessary parentheses
+2z-40+3z=0
We move all terms containing z to the left and all other terms to the right.
+2z+3z=0+40
We simplify left and right side of the equation.
+5z=+40
We divide both sides of the equation by 5 to get z.
z=8
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