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0.8x+7.85=3.4x-2.55
We move all terms to the left:
0.8x+7.85-(3.4x-2.55)=0
We get rid of parentheses
0.8x-3.4x+2.55+7.85=0
We add all the numbers together, and all the variables
-2.6x+10.4=0
We move all terms containing x to the left, all other terms to the right
-2.6x=-10.4
x=-10.4/-2.6
x=+4
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