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0.1x-28+0.3x-48=180
We move all terms to the left:
0.1x-28+0.3x-48-(180)=0
We add all the numbers together, and all the variables
0.4x-256=0
We move all terms containing x to the left, all other terms to the right
0.4x=256
x=256/0.4
x=640
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