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3.5x-42.9=-15.6
We move all terms to the left:
3.5x-42.9-(-15.6)=0
We add all the numbers together, and all the variables
3.5x-27.3=0
We move all terms containing x to the left, all other terms to the right
3.5x=27.3
x=27.3/3.5
x=7+2.8/3.5
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