Does this sentence make sense considering that it is in the present tense and the presence of previously in it? Is there a better sentence for it?
Plenty of solutions are previously proposed to address the problem.
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No, it doesn't make sense. "Are" is present tense, and you are clearly using past. Therefore you should change it out to "Were", "Have been" or something similar.
Plenty of solutions have been previously proposed to address the problem
If actually supposed to be present tense, say this:
Plenty of solutions are being proposed to address this problem