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1.3x-4.5=15
We move all terms to the left:
1.3x-4.5-(15)=0
We add all the numbers together, and all the variables
1.3x-19.5=0
We move all terms containing x to the left, all other terms to the right
1.3x=19.5
x=19.5/1.3
x=15
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