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4.6=-1.28b
We move all terms to the left:
4.6-(-1.28b)=0
We get rid of parentheses
1.28b+4.6=0
We move all terms containing b to the left, all other terms to the right
1.28b=-4.6
b=-4.6/1.28
b=-3+0.76/1.28
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