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-7.2(1+6.8x)-0.4=139.28
We move all terms to the left:
-7.2(1+6.8x)-0.4-(139.28)=0
We add all the numbers together, and all the variables
-7.2(6.8x+1)-0.4-(139.28)=0
We add all the numbers together, and all the variables
-7.2(6.8x+1)-139.68=0
We multiply parentheses
-43.2x-7.2-139.68=0
We add all the numbers together, and all the variables
-43.2x-146.88=0
We move all terms containing x to the left, all other terms to the right
-43.2x=146.88
x=146.88/-43.2
x=-3+13.5/33.75
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