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0.2x-1.8=21
We move all terms to the left:
0.2x-1.8-(21)=0
We add all the numbers together, and all the variables
0.2x-22.8=0
We move all terms containing x to the left, all other terms to the right
0.2x=22.8
x=22.8/0.2
x=114
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