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1.2(3x+5)=20.4
We move all terms to the left:
1.2(3x+5)-(20.4)=0
We add all the numbers together, and all the variables
1.2(3x+5)-20.4=0
We multiply parentheses
3.6x+6-20.4=0
We add all the numbers together, and all the variables
3.6x-14.4=0
We move all terms containing x to the left, all other terms to the right
3.6x=14.4
x=14.4/3.6
x=4
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