fixed bug that allowed equations with no solutions to arise
improved problem
added 3 solutions
Merge branch 'develop' of /opt/webwork/courses/vega-LibDev/templates/local/PCC into develop
added solution, PGML, etc
spruced up a problem
added solution
fixed incorrect answer
solutions and tidying of two problems
added two more solutions
added solutions, PGML, etc
cleaned one problems coefficients; added PGML, solutions etc to another
added solutions, PGML, etc
added solutions, PGML, minor tweaks, etc