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5(x-3)+6(x-12)+2(x+2)=6.4
We move all terms to the left:
5(x-3)+6(x-12)+2(x+2)-(6.4)=0
We add all the numbers together, and all the variables
5(x-3)+6(x-12)+2(x+2)-6.4=0
We multiply parentheses
5x+6x+2x-15-72+4-6.4=0
We add all the numbers together, and all the variables
13x-89.4=0
We move all terms containing x to the left, all other terms to the right
13x=89.4
x=89.4/13
x=6+8.1428571428571/9.2857142857142
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