There are only one solution.
8x - 15x = 0
Combine the 'like' terms on the left side of the equation:
-7x = 0
Divide each side by -7 :
x = 0
This are the only solution to the equation.
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6z - 3 = 0
many solutions
It has two equal solutions of 2
It has two solutions and they are: x = 3.230396696 and x = -2.063730029
There are no real solutions. The discriminant (b squared -4ac) is less than 0, so there are 2 imaginary solutions and 0 real ones.