tolong bantu yang no 40.

2x+20+3x-11+x+15=180
6x+24=180
6x=180-24
x=156/6
x=26

2x+20=2.26+20=72
3x-11=3.26-11=67
x+15=26+15=41

180 = 2x + 20 + 3x - 11 + x + 15
180 = 6x + 24
156 = 6x
x = 26

1. 2x + 10 = 2(26) + 20 = 52 + 20 = 72
2. 3x - 11  = 3(26) - 11 = 78 - 11 = 67
3. x + 15 = 26 + 15 = 41