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0.20x+0.45(30)=3.15
We move all terms to the left:
0.20x+0.45(30)-(3.15)=0
We add all the numbers together, and all the variables
0.20x-2.697=0
We move all terms containing x to the left, all other terms to the right
0.20x=2.697
x=2.697/0.20
x=13+0.097/0.20
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