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0.5x+0.4=0.9x-2.4
We move all terms to the left:
0.5x+0.4-(0.9x-2.4)=0
We get rid of parentheses
0.5x-0.9x+2.4+0.4=0
We add all the numbers together, and all the variables
-0.4x+2.8=0
We move all terms containing x to the left, all other terms to the right
-0.4x=-2.8
x=-2.8/-0.4
x=6+0.4/0.4
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