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-17.9+3.9x=7.8x-2.3
We move all terms to the left:
-17.9+3.9x-(7.8x-2.3)=0
We get rid of parentheses
3.9x-7.8x+2.3-17.9=0
We add all the numbers together, and all the variables
-3.9x-15.6=0
We move all terms containing x to the left, all other terms to the right
-3.9x=15.6
x=15.6/-3.9
x=-4
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