Question 934384
Giving a specific example might be better.


x, an unknown variable.
Other variables as constants.


This example fits your description:
{{{(k+x)/d=r}}}


Objective is solve for the unknown x.  Use number properties to isolate x on one side and all constants on the other side.  Look at how x appears in the original equation, and identify everything that was done to it to make the equation.  


Started with x;
Added k;
Multiplied by {{{1/d}}};
The result gave r.
-
Do all the steps in REVERSE order and use the INVERSES to do it.


Starting now with the original equation:
Multiply by the multiplicative inverse of {{{1/r}}};
Add the additive inverse of {{{k}}};
DONE.  


Those steps should look like this or consistant with:


{{{(k+x)/d=r}}}


{{{k+x=r*d}}}


{{{x=r*d-k}}}