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4=-0.2x+3x
We move all terms to the left:
4-(-0.2x+3x)=0
We add all the numbers together, and all the variables
-(+2.8x)+4=0
We get rid of parentheses
-2.8x+4=0
We move all terms containing x to the left, all other terms to the right
-2.8x=-4
x=-4/-2.8
x=1+1/2.3333333333333
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