solve 
(sŏlv, sôlv)
(sŏlv, sôlv)v. solved, solv·ing, solves
v.tr.
To find an answer to, explanation for, or way of dealing with (a problem, for example).
v.intr.
To solve an equation: Insert the values of the constants and solve for x.
[Middle English solven, to loosen, from Latin solvere; see leu- in the Appendix of Indo-European roots.]
solver n.