12x-39+8x+5=90

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Solution for 12x-39+8x+5=90 equation: 



12x-39+8x+5=90

We move all terms to the left:

12x-39+8x+5-(90)=0

We add all the numbers together, and all the variables

20x-124=0

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

20x=124

x=124/20

x=6+1/5

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