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20+1.3x=3
We move all terms to the left:
20+1.3x-(3)=0
We add all the numbers together, and all the variables
1.3x+17=0
We move all terms containing x to the left, all other terms to the right
1.3x=-17
x=-17/1.3
x=-13+0.099999999999998/1.3
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