I12+5x=7x+4

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Solution for I12+5x=7x+4 equation: 



12+5I=7I+4

We move all terms to the left:

12+5I-(7I+4)=0

We get rid of parentheses

5I-7I-4+12=0

We add all the numbers together, and all the variables

-2I+8=0

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

-2I=-8

I=-8/-2

I=+4

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