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3(4x-2.9)=3x-8.7
We move all terms to the left:
3(4x-2.9)-(3x-8.7)=0
We multiply parentheses
12x-(3x-8.7)-8.7=0
We get rid of parentheses
12x-3x+8.7-8.7=0
We add all the numbers together, and all the variables
9x=0
x=0/9
x=0
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