The domain of a function is the set of it's possible x values that will make the function work and output y values. In this case, it would be all the real numbers.
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The [ 2x + 1 ] represents a function of 'y' .
x=1
2x = -7 - 8y
x=5.54x+1= 2x+12-1 -14x=2x+11-2x -2x2x=11/2 /2x=5.5
Y = 2x + 1