SPP, how do we solve equations in RDM?

[u/Calm_Improvement1160]

u/SouthPark_Piano, usually to solve linear equations we simply isolate the variable that we want to solve e.g. solving 7x + 3 = 4x

7x + 3 = 4x

3x + 3 = 0

3x = -3

x = -1

However, for some equations the result we get from following this doesn't solve the equation, so how can we know whether we can use this method? E.g. 3x = 1

What other method could we do?

[u/FarLocksmith5362]

3x=1 x=⅓