3=15-4x

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Solution for 3=15-4x equation: 



3=15-4x

We move all terms to the left:

3-(15-4x)=0

We add all the numbers together, and all the variables

-(-4x+15)+3=0

We get rid of parentheses

4x-15+3=0

We add all the numbers together, and all the variables

4x-12=0

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

4x=12

x=12/4

x=3

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