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3.1x+4-2.6x=6
We move all terms to the left:
3.1x+4-2.6x-(6)=0
We add all the numbers together, and all the variables
0.5x-2=0
We move all terms containing x to the left, all other terms to the right
0.5x=2
x=2/0.5
x=4
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