12x+9=13x+4

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Solution for 12x+9=13x+4 equation: 



12x+9=13x+4

We move all terms to the left:

12x+9-(13x+4)=0

We get rid of parentheses

12x-13x-4+9=0

We add all the numbers together, and all the variables

-1x+5=0

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

-x=-5

x=-5/-1

x=+5

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