x+3+2x+12=90

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Solution for x+3+2x+12=90 equation: 



x+3+2x+12=90

We move all terms to the left:

x+3+2x+12-(90)=0

We add all the numbers together, and all the variables

3x-75=0

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

3x=75

x=75/3

x=25

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