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0.04x+0.07(8.000-x)=480
We move all terms to the left:
0.04x+0.07(8.000-x)-(480)=0
We add all the numbers together, and all the variables
0.04x+0.07(-1x+8)-480=0
We multiply parentheses
0.04x-0.07x+0.56-480=0
We add all the numbers together, and all the variables
-0.03x-479.44=0
We move all terms containing x to the left, all other terms to the right
-0.03x=479.44
x=479.44/-0.03
x=-15981+0.00999999999999/0.03
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