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Which has a Unique solution, No solution, or infinitely many solutions?

1. 2X + 3 = 9
2. 9X+ 2 = 9X+ 2
3. (1/2X+3) = (1/3x+9)
4. (x+2)(x+3) = x*x (x squared) + 5x + 6
5. 2(2x+3) = 4x+6

my guess is
1. unique
2. no
3. unique
4. unique
5. infinite
6. infinte

but I know at least one is wrong but not sure which one??

1 answer

2. 0=0 therefore, infinite
4. do you mean (x+2)(x+3) = x^2 + 5x + 6?
then, yes, infinite
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