X+(X+3)+(X+6)+(x+9)+(X+12)+(x+15)+(x+18)=126

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Solution for X+(X+3)+(X+6)+(x+9)+(X+12)+(x+15)+(x+18)=126 equation: 



X+(X+3)+(X+6)+(X+9)+(X+12)+(X+15)+(X+18)=126

We move all terms to the left:

X+(X+3)+(X+6)+(X+9)+(X+12)+(X+15)+(X+18)-(126)=0

We get rid of parentheses

X+X+X+X+X+X+X+3+6+9+12+15+18-126=0

We add all the numbers together, and all the variables

7X-63=0

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

7X=63

X=63/7

X=9

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