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8.5(x+0.4)=130.9
We move all terms to the left:
8.5(x+0.4)-(130.9)=0
We add all the numbers together, and all the variables
8.5(x+0.4)-130.9=0
We multiply parentheses
8.5x+3.4-130.9=0
We add all the numbers together, and all the variables
8.5x-127.5=0
We move all terms containing x to the left, all other terms to the right
8.5x=127.5
x=127.5/8.5
x=15
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