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20-0.18x=11.72
We move all terms to the left:
20-0.18x-(11.72)=0
We add all the numbers together, and all the variables
-0.18x+8.28=0
We move all terms containing x to the left, all other terms to the right
-0.18x=-8.28
x=-8.28/-0.18
x=+46
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