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99=4z+45+2z
We move all terms to the left:
99-(4z+45+2z)=0
We add all the numbers together, and all the variables
-(6z+45)+99=0
We get rid of parentheses
-6z-45+99=0
We add all the numbers together, and all the variables
-6z+54=0
We move all terms containing z to the left, all other terms to the right
-6z=-54
z=-54/-6
z=+9
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