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7. yg tdk gemar mtka maupun ipa = 43 - ((31 - 16) + 16 + (24 - 16))
= 43 - 39
= 4 orang
8. 3a + 5a = 180
a = 22,5
7.31-16=15
24-16=8
43-15-8-16=4
jadi isinya=a
8.3a+5a=180(sudut lurus)
8a=180
a=180:8=22,5
jadi isinya=d