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139.95=10z+19.95
We move all terms to the left:
139.95-(10z+19.95)=0
We get rid of parentheses
-10z-19.95+139.95=0
We add all the numbers together, and all the variables
-10z+120=0
We move all terms containing z to the left, all other terms to the right
-10z=-120
z=-120/-10
z=+12
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