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2z(z)-5z-12=z(z)-15
We move all terms to the left:
2z(z)-5z-12-(z(z)-15)=0
We add all the numbers together, and all the variables
-5z+2zz-(zz-15)-12=0
We get rid of parentheses
-5z+2zz-zz+15-12=0
We add all the numbers together, and all the variables
-5z+2zz-zz+3=0
We move all terms containing z to the left, all other terms to the right
-5z+2zz-zz=-3
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