If the question is in the context of angles, then
x + 20 + x + 10 = 90
ie 2x + 30 = 90
or 2x = 60 which gives x = 30
If: 3x+20 = 2x-10 Then: x = -30
70
20 + 50 + 20 + 10 = 50 = 150
5 + 20 = 25
10 plus 20-2 - 11 plus 3 is equal to 20.
If: 3x+20 = 2x-10 Then: x = -30
70
20 + 50 + 20 + 10 = 50 = 150
30 or -10 if the 20 is negative.
5 + 20 = 25
2+2+2+10+5+5+5+20+20+20+20+20+20=151
10 plus 20-2 - 11 plus 3 is equal to 20.
Calculate 10^2 - 4*(-16)*(-20)
20 + 10 + 5 = 35
10 + 15 + 20 = 45
-10
14.95 + 20 + 10 + 2.06 = 47.01