7+5=4x

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Solution for 7+5=4x equation: 



7+5=4x

We move all terms to the left:

7+5-(4x)=0

We add all the numbers together, and all the variables

-4x+12=0

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

-4x=-12

x=-12/-4

x=+3

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