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6=2a-4

We move all terms to the left:

6-(2a-4)=0

We get rid of parentheses

-2a+4+6=0

We add all the numbers together, and all the variables

-2a+10=0

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

-2a=-10

a=-10/-2

a=+5

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