12x+3+x=90

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Solution for 12x+3+x=90 equation: 



12x+3+x=90

We move all terms to the left:

12x+3+x-(90)=0

We add all the numbers together, and all the variables

13x-87=0

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

13x=87

x=87/13

x=6+9/13

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