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6x+40+3x+30+x = 180
10x = 180-70
10x = 110
x = 11
jadi x = 11 derajat
maaf kalo salah
6x + 3x + 30x + x + 40 = 180
40x + 40 = 180
40x = 180 - 40
40x = 140
x = 140
40
= 3,5