15x+21=3x+39

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Solution for 15x+21=3x+39 equation: 



15x+21=3x+39

We move all terms to the left:

15x+21-(3x+39)=0

We get rid of parentheses

15x-3x-39+21=0

We add all the numbers together, and all the variables

12x-18=0

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

12x=18

x=18/12

x=1+1/2

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