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15x-25x=1.2
We move all terms to the left:
15x-25x-(1.2)=0
We add all the numbers together, and all the variables
-10x-1.2=0
We move all terms containing x to the left, all other terms to the right
-10x=1.2
x=1.2/-10
x=-1/8.3333333333333
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