15-20=3+8x+12

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Solution for 15-20=3+8x+12 equation: 



15-20=3+8x+12

We move all terms to the left:

15-20-(3+8x+12)=0

We add all the numbers together, and all the variables

-(8x+15)+15-20=0

We add all the numbers together, and all the variables

-(8x+15)-5=0

We get rid of parentheses

-8x-15-5=0

We add all the numbers together, and all the variables

-8x-20=0

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

-8x=20

x=20/-8

x=-2+1/2

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