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z+(0.72)+(-0.72)=-2.5+(-0.72)
We move all terms to the left:
z+(0.72)+(-0.72)-(-2.5+(-0.72))=0
We add all the numbers together, and all the variables
z+3.22=0
We move all terms containing z to the left, all other terms to the right
z=-3.22
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