103=12+7x

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Solution for 103=12+7x equation: 



103=12+7x

We move all terms to the left:

103-(12+7x)=0

We add all the numbers together, and all the variables

-(7x+12)+103=0

We get rid of parentheses

-7x-12+103=0

We add all the numbers together, and all the variables

-7x+91=0

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

-7x=-91

x=-91/-7

x=+13

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