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(0.91*0.8)*x=6
We move all terms to the left:
(0.91*0.8)*x-(6)=0
We add all the numbers together, and all the variables
(0.728)*x-6=0
We multiply parentheses
0.728x-6=0
We move all terms containing x to the left, all other terms to the right
0.728x=6
x=6/0.728
x=8+0.176/0.728
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