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0.1x+0.4(15-x)=3
We move all terms to the left:
0.1x+0.4(15-x)-(3)=0
We add all the numbers together, and all the variables
0.1x+0.4(-1x+15)-3=0
We multiply parentheses
0.1x-0.4x+6-3=0
We add all the numbers together, and all the variables
-0.3x+3=0
We move all terms containing x to the left, all other terms to the right
-0.3x=-3
x=-3/-0.3
x=+10
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