Раскройте скобки и приведите подобные слагаемые: 5ts+(g+6s)(2t-3h) - 4th-2(5t - 3s)(2h+3g) =

Раскроем скобки и приведем подобные слагаемые:

$$5ts+(g+6s)(2t-3h) - 4th-2(5t - 3s)(2h+3g) =$$

$$=5ts + 2gt - 3gh + 12st - 18sh - 4th - 4(5thg+7.5tg-3sh^2-4.5sg)=$$

$$= 5ts + 2gt - 3gh + 12st - 18sh - 4th - (20th - 30thg + 12sh + 18sg) =$$

$$= 5ts + 2gt - 3gh + 12st - 18sh - 4th - 20th + 30thg - 12sh - 18sg=$$

$$=5ts + 12st + 2gt - 3gh - 30sh - 24th - 18sg + 30gh=$$

$$=17ts + 2gt +27gh - 30sh - 24th - 18sg$$

Ответ: $$17ts + 2gt +27gh - 30sh - 24th - 18sg$$