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30.6+10.2x=51
We move all terms to the left:
30.6+10.2x-(51)=0
We add all the numbers together, and all the variables
10.2x-20.4=0
We move all terms containing x to the left, all other terms to the right
10.2x=20.4
x=20.4/10.2
x=2
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