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3x+3.6=8.7
We move all terms to the left:
3x+3.6-(8.7)=0
We add all the numbers together, and all the variables
3x-5.1=0
We move all terms containing x to the left, all other terms to the right
3x=5.1
x=5.1/3
x=1+2.1/3
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