x+12+3x=90

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



x+12+3x=90

We move all terms to the left:

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

We add all the numbers together, and all the variables

4x-78=0

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

4x=78

x=78/4

x=19+1/2

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