Infinitely many: they are the same line!
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Only 1.
It has two solutions and they are: x = 3.230396696 and x = -2.063730029
Through a process of elimination and substitution the solutions are s = 8 and x = 5
There are two solutions for x: x=11 and x=-7
One solution: x = -4
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x = 4y = 1Only one solution:x = 1y = 0.25