3x+x+42=90

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Solution for 3x+x+42=90 equation: 



3x+x+42=90

We move all terms to the left:

3x+x+42-(90)=0

We add all the numbers together, and all the variables

4x-48=0

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

4x=48

x=48/4

x=12

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