20 < 12 ⋅ x = 64
This is somewhat of a false equation though, due to the left side "20" is not less than the right side "12 ", which means that the given statement is false.
So I switched it up and made the variable "12"
12 < 20 ⋅ x = 64
12x - 20 = 64
12x = 64 + 20
12x = 84
12x⁄12 = 84⁄12
x = 7
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I hope this helps, as always. I wish you the best of luck and have a nice day, friend..