# Revision history [back]

### Different syntax to solve

I've below equation( j.mp/sage_emi ) involving 4 variables. I've fixed 3 variables' values, but can't get the 4th variables' value (both, including numerical). Can someone fix the code? Manually, I can get the answer for emi as 1210/21.

P, emi, rate, duration = var("P emi rate duration")
eq1 = P = emi * (( 1 + rate / 100)^ duration - 1) / (rate / 100) / (1 + rate /100)^ duration
solve([eq1, P == 100, duration == 2, rate == 10], emi)


It would be helpful if someone writes 2,3 different sage code to achieve the same above objective.

I'm just curious can we do this:

solve([eq1], rate)