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0.50x+1.8-0.20x=4.05
We move all terms to the left:
0.50x+1.8-0.20x-(4.05)=0
We add all the numbers together, and all the variables
0.3x-2.25=0
We move all terms containing x to the left, all other terms to the right
0.3x=2.25
x=2.25/0.3
x=7+0.15/0.3
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