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0.1x+520.3x+50=90
We move all terms to the left:
0.1x+520.3x+50-(90)=0
We add all the numbers together, and all the variables
520.4x-40=0
We move all terms containing x to the left, all other terms to the right
520.4x=40
x=40/520.4
x=1/13.01
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