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2.1(z+6.6)-1=5.09
We move all terms to the left:
2.1(z+6.6)-1-(5.09)=0
We add all the numbers together, and all the variables
2.1(z+6.6)-6.09=0
We multiply parentheses
2.1z+13.86-6.09=0
We add all the numbers together, and all the variables
2.1z+7.77=0
We move all terms containing z to the left, all other terms to the right
2.1z=-7.77
z=-7.77/2.1
z=-3+1/1.4285714285714
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