you don't have contunuition of these problem.first check the problem correctly and post here
solution:-
8g+12h+5g-20h
Arrange the variables
8g+5g+12h-20h
13g-8h (In addition or subtraction we should use bigger no. sign in answer)
4 X 2g +4x3h + (5 X g - 5 X 4h)
= 8g+12h+(5g-20h)
then i combine both signs
8g + 5g + 12h - 20h
= 13g - 8h
Step 1: Open parentheses by multiplying number outside the parentheses by the number inside:
4(2g + 3h) + 5(g-4h) = 8g + 12h + 5g - 20h
Step 2: Combine like terms
8g + 5g + 5g - 20h = 13g - 18h