Find the solution set for the equation.
|x - 7| = | 8 - x|
|x - 7| = | 8 - x|
means
x - 7 = 8 - x or x - 7 = -8 + x (which has no solution)
we we can write
x + x - 7 - 8 = -x + x
2x -15 = 0
2x = 15
x = 15/2
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