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2x+1.3x+20x=180
We move all terms to the left:
2x+1.3x+20x-(180)=0
We add all the numbers together, and all the variables
23.3x-180=0
We move all terms containing x to the left, all other terms to the right
23.3x=180
x=180/23.3
x=7+8.89473684211/12.2631578947
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