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5(0.85)x=12
We move all terms to the left:
5(0.85)x-(12)=0
We multiply parentheses
4.25x-12=0
We move all terms containing x to the left, all other terms to the right
4.25x=12
x=12/4.25
x=2+2.33333333333/2.83333333333
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