x=(7.5-3)=21

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Solution for x=(7.5-3)=21 equation: 



x=(7.5-3)=21

We move all terms to the left:

x-((7.5-3))=0

We add all the numbers together, and all the variables

x-((4.5))=0

We add all the numbers together, and all the variables

x-4.5=0

We move all terms containing x to the left, all other terms to the right

x=4.5

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