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0.4x=5.1
We move all terms to the left:
0.4x-(5.1)=0
We add all the numbers together, and all the variables
0.4x-5.1=0
We move all terms containing x to the left, all other terms to the right
0.4x=5.1
x=5.1/0.4
x=12+0.3/0.4
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