55 - 2X = 7X + 19
add 2X to each side
55 = 9X + 19
subtract 19 from each side
36 = 9X
divide each sides integers by 9
4 = X
------------check in original equation
55 - 2(4) = 7(4) + 19
55 - 8 = 28 + 19
47 = 47
----------------checks
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