21=3.5x-3

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Solution for 21=3.5x-3 equation: 



21=3.5x-3

We move all terms to the left:

21-(3.5x-3)=0

We get rid of parentheses

-3.5x+3+21=0

We add all the numbers together, and all the variables

-3.5x+24=0

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

-3.5x=-24

x=-24/-3.5

x=6+1/1.1666666666667

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