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21+0.17x=55
We move all terms to the left:
21+0.17x-(55)=0
We add all the numbers together, and all the variables
0.17x-34=0
We move all terms containing x to the left, all other terms to the right
0.17x=34
x=34/0.17
x=199+0.16999999999999/0.17
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