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30.1=19.7+0.8x
We move all terms to the left:
30.1-(19.7+0.8x)=0
We add all the numbers together, and all the variables
-(0.8x+19.7)+30.1=0
We get rid of parentheses
-0.8x-19.7+30.1=0
We add all the numbers together, and all the variables
-0.8x+10.4=0
We move all terms containing x to the left, all other terms to the right
-0.8x=-10.4
x=-10.4/-0.8
x=+13
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