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1240=21.71x+250
We move all terms to the left:
1240-(21.71x+250)=0
We get rid of parentheses
-21.71x-250+1240=0
We add all the numbers together, and all the variables
-21.71x+990=0
We move all terms containing x to the left, all other terms to the right
-21.71x=-990
x=-990/-21.71
x=45+12.428571428572/20.676190476191
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