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0.3x+0.3(10)=0.1(x+40)
We move all terms to the left:
0.3x+0.3(10)-(0.1(x+40))=0
We add all the numbers together, and all the variables
0.3x-(0.1(x+40))+0.31=0
We calculate terms in parentheses: -(0.1(x+40)), so:We get rid of parentheses
0.1(x+40)
We multiply parentheses
0.1x+4
Back to the equation:
-(0.1x+4)
0.3x-0.1x-4+0.31=0
We add all the numbers together, and all the variables
0.2x-3.69=0
We move all terms containing x to the left, all other terms to the right
0.2x=3.69
x=3.69/0.2
x=18+0.09/0.2
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