The Algebra of Marriage

I took algebra in middle school, calculus in high school... so I like formulas. Here's one I've been working on for a while:

H = husband
W = wife
T = history or past, cumulatively variable with time
C = Choices- actions, words, attitudes
E = environment- work, in-laws, kids, the economy, bills, ex's...
P = present
M = Marriage

Wp = W (T + C)
Hp = H (T + C)

M = E (Wp x Hp)