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3 (z-21)+2 (z-2)=28
We simplify the equation to the form, which is simple to understand
3(z-21)+2(z-2)=28
Reorder the terms in parentheses
+(+3z-63)+2*(z-2)=28
Remove unnecessary parentheses
+3z-63+2+*(+z-2+)=+28
Reorder the terms in parentheses
+3z-63+(+2z-4)=28
Remove unnecessary parentheses
+3z-63+2z-4=+28
We move all terms containing z to the left and all other terms to the right.
+3z+2z=+28+63+4
We simplify left and right side of the equation.
+5z=+95
We divide both sides of the equation by 5 to get z.
z=19
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