x+(x+12)+3(x+12)=123

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Solution for x+(x+12)+3(x+12)=123 equation: 



x+(x+12)+3(x+12)=123

We move all terms to the left:

x+(x+12)+3(x+12)-(123)=0

We multiply parentheses

x+(x+12)+3x+36-123=0

We get rid of parentheses

x+x+3x+12+36-123=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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