3x+12=4x+1=90

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Solution for 3x+12=4x+1=90 equation: 



3x+12=4x+1=90

We move all terms to the left:

3x+12-(4x+1)=0

We get rid of parentheses

3x-4x-1+12=0

We add all the numbers together, and all the variables

-1x+11=0

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

-x=-11

x=-11/-1

x=+11

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