A solution to an linear equation
cx + d = f is in the form x = a for some a, we call a the solution (a might not be unique).
Rewrite your sentence:
x = 8, 8 is unique. So how many solution does it have?
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Infinitely many: they are the same line!
1
Only 1.
It has two solutions and they are: x = 3.230396696 and x = -2.063730029
There are two solutions for x: x=11 and x=-7