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2z^{2}-z-15=\left(z-6\right)\left(2z-2\right)-1
Use the distributive property to multiply 2z+5 by z-3 and combine like terms.
2z^{2}-z-15=2z^{2}-14z+12-1
Use the distributive property to multiply z-6 by 2z-2 and combine like terms.
2z^{2}-z-15=2z^{2}-14z+11
Subtract 1 from 12 to get 11.
2z^{2}-z-15-2z^{2}=-14z+11
Subtract 2z^{2} from both sides.
-z-15=-14z+11
Combine 2z^{2} and -2z^{2} to get 0.
-z-15+14z=11
Add 14z to both sides.
13z-15=11
Combine -z and 14z to get 13z.
13z=11+15
Add 15 to both sides.
13z=26
Add 11 and 15 to get 26.
z=\frac{26}{13}
Divide both sides by 13.
z=2
Divide 26 by 13 to get 2.