Fix linear equation system solving in Calc (bug#35374)
* lisp/calc/calcalg2.el (math-try-solve-for): To solve Ax^n=0 where A is a nonzero constant and x the variable to solve for, solve x^n=0 instead of solving A=0 (which obviously fails) or something equally stupid. * test/lisp/calc/calc-tests.el (calc-test-solve-linear-system): New.
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