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To solve tan x = x by graphical method, draw the graph of y =x and y = tan x. Remember x is in radians and not degrees.

See diagram.

we can have values in the range  x = -π/2 to +π/2

| tan x | > |x| always , except at x = 0

There is  only one solution ,  x = 0 or +- n π  where n is an integer