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2.4(3x+2)+0.3(x+4)=66
We move all terms to the left:
2.4(3x+2)+0.3(x+4)-(66)=0
We multiply parentheses
7.2x+0.3x+4.8+1.2-66=0
We add all the numbers together, and all the variables
7.5x-60=0
We move all terms containing x to the left, all other terms to the right
7.5x=60
x=60/7.5
x=8
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