Question 159201
1. 21=7x less than or equal to 7(3+x) 
Here you wrote = but is wrong
2. 9(w+2) < 9w +17 
{{{9w+18<9w+17}}} then  {{{18<17}}} (no solution)
3. 13(r+1) < 13r-6 
{{{13r+13<13r-6}}} then {{{13<-6}}} (no solution)
4. 2a-16 greater than or equal to 2a-17 
  {{{2a-16>=2a-17}}} then {{{-16>=-17}}} ( solution is all real numbers)
5. 3t-12 > 3t+2  then  {{{-12>2}}} (no solution)
6. 2-3g+7 greater than or equal to 3(2-g)
then {{{9-3g>=6-3g}}} then {{{9>=6}}} then ( solution is all real numbers)