(X-12)+(3x-12)+(3x-12)+x=87

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Solution for (X-12)+(3x-12)+(3x-12)+x=87 equation: 



(X-12)+(3X-12)+(3X-12)+X=87

We move all terms to the left:

(X-12)+(3X-12)+(3X-12)+X-(87)=0

We add all the numbers together, and all the variables

X+(X-12)+(3X-12)+(3X-12)-87=0

We get rid of parentheses

X+X+3X+3X-12-12-12-87=0

We add all the numbers together, and all the variables

8X-123=0

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

8X=123

X=123/8

X=15+3/8

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