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4x+8=0.1x+3+3.9-
We move all terms to the left:
4x+8-(0.1x+3+3.9-)=0
We add all the numbers together, and all the variables
4x-(+0.1x)+8=0
We get rid of parentheses
4x-0.1x+8=0
We add all the numbers together, and all the variables
3.9x+8=0
We move all terms containing x to the left, all other terms to the right
3.9x=-8
x=-8/3.9
x=-2+0.2/3.9
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