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15.3+x=1.3+3
We move all terms to the left:
15.3+x-(1.3+3)=0
We add all the numbers together, and all the variables
x+15.3-(4.3)=0
We add all the numbers together, and all the variables
x+11=0
We move all terms containing x to the left, all other terms to the right
x=-11
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