10(7g-9h)-4h-8(-h+8g) solve for g 7g + 8g since both are positive 15g solve for h 9h+4h since both are negative -14h 10-8 since the 8 is negative 12 12(15g-14h)
Since you typed the same equation twice I didn’t know if you meant to , so if it was meant to be doubled it would be
