x+12=5.x-8

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Solution for x+12=5.x-8 equation: 



x+12=5.x-8

We move all terms to the left:

x+12-(5.x-8)=0

We get rid of parentheses

x-5.x+8+12=0

We add all the numbers together, and all the variables

-4x+20=0

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

-4x=-20

x=-20/-4

x=+5

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