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81+3x=180
3x= 99
x=33
jadi..
35 + 2x +30 + x + 16 = 180
3x + 46 = 180 - 35
3x + 46 = 145
3x = 145 - 46
3x = 99
x = 99 : 3
= 33
.jadi nilai x dari segitiga diatas adalah 33