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3.4x-1.8-4.2x=-1.8x-1.2
We move all terms to the left:
3.4x-1.8-4.2x-(-1.8x-1.2)=0
We add all the numbers together, and all the variables
-0.8x-(-1.8x-1.2)-1.8=0
We get rid of parentheses
-0.8x+1.8x+1.2-1.8=0
We add all the numbers together, and all the variables
x-0.6=0
We move all terms containing x to the left, all other terms to the right
x=0.6
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