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10x+20(8.100-x)=125.000
We move all terms to the left:
10x+20(8.100-x)-(125.000)=0
We add all the numbers together, and all the variables
10x+20(-1x+8.1)-125=0
We multiply parentheses
10x-20x+162-125=0
We add all the numbers together, and all the variables
-10x+37=0
We move all terms containing x to the left, all other terms to the right
-10x=-37
x=-37/-10
x=3+7/10
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