12x-15=20+7x

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Solution for 12x-15=20+7x equation: 



12x-15=20+7x

We move all terms to the left:

12x-15-(20+7x)=0

We add all the numbers together, and all the variables

12x-(7x+20)-15=0

We get rid of parentheses

12x-7x-20-15=0

We add all the numbers together, and all the variables

5x-35=0

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

5x=35

x=35/5

x=7

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