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0.70x-0.20(40+x)=0.80(40)
We move all terms to the left:
0.70x-0.20(40+x)-(0.80(40))=0
We add all the numbers together, and all the variables
0.70x-0.20(x+40)-(0.804)=0
We add all the numbers together, and all the variables
0.70x-0.20(x+40)-0.804=0
We multiply parentheses
0.70x-0.2x-8-0.804=0
We add all the numbers together, and all the variables
0.5x-8.804=0
We move all terms containing x to the left, all other terms to the right
0.5x=8.804
x=8.804/0.5
x=17+0.304/0.5
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