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0.3x-23+0.2x-48=90
We move all terms to the left:
0.3x-23+0.2x-48-(90)=0
We add all the numbers together, and all the variables
0.5x-161=0
We move all terms containing x to the left, all other terms to the right
0.5x=161
x=161/0.5
x=322
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