13x+12x=90

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Solution for 13x+12x=90 equation: 



13x+12x=90

We move all terms to the left:

13x+12x-(90)=0

We add all the numbers together, and all the variables

25x-90=0

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

25x=90

x=90/25

x=3+3/5

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