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3x+87 = 180°
3x = 93°
x = 31°
x-27 = 31-27 = 4°
x-29 = 31-29 = 2° (terkecil)
x+143 = 31+143 = 174
x-27 + x - 29 + x +143 = 180 derajat
3x + 87 = 180
3x = 180 -87
3x = 93
x = 31
( x-27 ) = 31-27
= 4 derajat
(x-29) = 31-29
= 2 derajat
(x+143) = 31+143
= 174 derajat
jadi sudut terkecil = 2 derajat