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3(9-z)-45=21z-6(3+4z)
We simplify the equation to the form, which is simple to understand
3(9-z)-45=21z-6(3+4z)
Reorder the terms in parentheses
+(+27-3z)-45=21z-6*(3+4z)
Remove unnecessary parentheses
+27-3z-45=+21z-6+*(+3+4z+)
Reorder the terms in parentheses
+27-3z-45=21z+(-18-24z)
Remove unnecessary parentheses
+27-3z-45=+21z-18-24z
We move all terms containing z to the left and all other terms to the right.
-3z-21z+24z=-18-27+45
We simplify left and right side of the equation.
z=0
0=0
This equation is an identity, so all real numbers are solutions.
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