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-2(5.25+6.2x)=4(-3.1x+2.68
We move all terms to the left:
-2(5.25+6.2x)-(4(-3.1x+2.68)=0
We add all the numbers together, and all the variables
-2(6.2x+5.25)-(4(-3.1x+2.68)=0
We multiply parentheses
-12x-(4(-3.1x+2.68)-10.5=0
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