Give some advice to a person who is going on an archaeological expedition in some tropical country. Use the ideas from the dialogue in Ex. 49.

(х+4):6-(9-7х):15=-3
х:6 + 4:6 - 9:15 + 7х:15 =-3
1/6х + 4/6 - 9/15 + 7/15х=-3
(5/30+14/30)х + 20/30 - 18/30=-3
19/30х+2/30=-3
19/30х=-3-2/30
19/30х=-3 2/30
х=-3 2/30:19/30
х=-92/30 * 30/19
х=92/19
х=4 16/19