4x+3+x+12=90

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



4x+3+x+12=90

We move all terms to the left:

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

We add all the numbers together, and all the variables

5x-75=0

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

5x=75

x=75/5

x=15

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