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.9x-2.5=3.1x+1.6
We move all terms to the left:
.9x-2.5-(3.1x+1.6)=0
We get rid of parentheses
.9x-3.1x-1.6-2.5=0
We add all the numbers together, and all the variables
-2.2x-4.1=0
We move all terms containing x to the left, all other terms to the right
-2.2x=4.1
x=4.1/-2.2
x=-1+1/1.15789473684
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