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15.9-5x=3.4
We move all terms to the left:
15.9-5x-(3.4)=0
We add all the numbers together, and all the variables
-5x+12.5=0
We move all terms containing x to the left, all other terms to the right
-5x=-12.5
x=-12.5/-5
x=2+2.5/5
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