Question 297581
{{{ 
T = 3R/M - n }}}

Add 'n' to each side:
{{{ T + n = 3R  }}}
Multiply both sides by M:
{{{ M(T+n) = 3R  }}}


Divide both sides by 3
{{{ (M(T + n))/3 = R  }}}
& bob's your uncle!