(x+12)+(4x-7)=18

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Solution for (x+12)+(4x-7)=18 equation: 



(x+12)+(4x-7)=18

We move all terms to the left:

(x+12)+(4x-7)-(18)=0

We get rid of parentheses

x+4x+12-7-18=0

We add all the numbers together, and all the variables

5x-13=0

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

5x=13

x=13/5

x=2+3/5

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