Tlong dibantu beserta jawabannya ya :)

gambar 1 : 90 = 2a + 3a

=> 90 = 5a

=> a = 90 ÷ 5

=> a = 18

gambar 2 : 180 = 46 + (a + 29) + (5a+15)

=>180 = 46 + a + 29 + 5a + 15

=>180 = 46 + 29 + 15 + a + 5a

=>180 = 90 + 6a

=> -6a = 90 – 180

=> -6a = -90

=> a = -90 ÷ – 6

=> a = 15

maaf klo salah