3x+12+4x=90

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Solution for 3x+12+4x=90 equation: 



3x+12+4x=90

We move all terms to the left:

3x+12+4x-(90)=0

We add all the numbers together, and all the variables

7x-78=0

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

7x=78

x=78/7

x=11+1/7

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