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0.9x+0.25=1.2x+0.4
We move all terms to the left:
0.9x+0.25-(1.2x+0.4)=0
We get rid of parentheses
0.9x-1.2x-0.4+0.25=0
We add all the numbers together, and all the variables
-0.3x-0.15=0
We move all terms containing x to the left, all other terms to the right
-0.3x=0.15
x=0.15/-0.3
x=-0.15/0.3
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