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2.1z+20.6=-8.2z.
We move all terms to the left:
2.1z+20.6-(-8.2z.)=0
We get rid of parentheses
2.1z+8.2z.+20.6=0
We move all terms containing z to the left, all other terms to the right
2.1z+8.2z.=-20.6
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