⌊x⌋ + 2 {-x} = 3x

__Notes__:

• ⌊N⌋ is floor of N, which is equal to the greatest integer less than or equal to N.

{N} = N - ⌊N⌋.

• Computer program/excel solver assisted solutions are welcome, but a semi-analytic (hand calculator and p&p) methodology is preferred.