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0.9z+(-1.91)=0.61
We move all terms to the left:
0.9z+(-1.91)-(0.61)=0
We add all the numbers together, and all the variables
0.9z-2.52=0
We move all terms containing z to the left, all other terms to the right
0.9z=2.52
z=2.52/0.9
z=2+0.72/0.9
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