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0.9x-2.9=3.9x+1.5
We move all terms to the left:
0.9x-2.9-(3.9x+1.5)=0
We get rid of parentheses
0.9x-3.9x-1.5-2.9=0
We add all the numbers together, and all the variables
-3x-4.4=0
We move all terms containing x to the left, all other terms to the right
-3x=4.4
x=4.4/-3
x=-1+1/2.1428571428571
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