tolong besok di kumpulkan

2a + 3a = 90
5a = 90
a = 90/5
a = 18

46 + a + 29 + 5a + 15 = 180
6a + 90 = 180
6a = 180-90
6a = 90
a = 90/6
a = 15

B + A = 180
B + 2/5B = 180
7/5B = 180
B = 180 : 7/5
B = 180 x 5/7
A = 2/5 x 900/7
A = 360/7

B + A = 90
B + 2/5B = 90
7/5B = 90
B = 90:7/5
B = 90 x 5/7
B = 450/7
A = 2/5 x 450/7
A = 180/7

B-A = 450/7 - 180/7
= 270/7