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73=4x-39

We move all terms to the left:

73-(4x-39)=0

We get rid of parentheses

-4x+39+73=0

We add all the numbers together, and all the variables

-4x+112=0

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

-4x=-112

x=-112/-4

x=+28

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