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This only builds a yacas command. You need to also call yac_str(), yac_expr() or similar. This is the reason that it does not call yacas: it depends on how you want it returned (string, expression).
yac_str()
yac_expr()
y_rmvars(x)
yacas command
cmd <- "{x == 2, y == 4}" yac_str(cmd) yac_str(y_rmvars(cmd))
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