21=4.50x+3

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Solution for 21=4.50x+3 equation: 



21=4.50x+3

We move all terms to the left:

21-(4.50x+3)=0

We get rid of parentheses

-4.50x-3+21=0

We add all the numbers together, and all the variables

-4.5x+18=0

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

-4.5x=-18

x=-18/-4.5

x=+4

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