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6x-30-2.50=40
We move all terms to the left:
6x-30-2.50-(40)=0
We add all the numbers together, and all the variables
6x-72.5=0
We move all terms containing x to the left, all other terms to the right
6x=72.5
x=72.5/6
x=12+0.5/6
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