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-31.7+4.5x=21
We move all terms to the left:
-31.7+4.5x-(21)=0
We add all the numbers together, and all the variables
4.5x-52.7=0
We move all terms containing x to the left, all other terms to the right
4.5x=52.7
x=52.7/4.5
x=11+2.6666666666667/3.75
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