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2.5-0.15x=0.4x
We move all terms to the left:
2.5-0.15x-(0.4x)=0
We add all the numbers together, and all the variables
-0.15x-(+0.4x)+2.5=0
We get rid of parentheses
-0.15x-0.4x+2.5=0
We add all the numbers together, and all the variables
-0.55x+2.5=0
We move all terms containing x to the left, all other terms to the right
-0.55x=-2.5
x=-2.5/-0.55
x=4+0.3/0.55
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