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160 + y - x = 180`
y - x = 20`
sudut B =
x + 2y + 20` = 90`
x + 2y = 70`
>> y - x = 20`
2y + x = 70` +
3y = 90`
y = 30`
>> 2y + x = 70`
2 . 30` + x = 70`
60` + x = 70`
x = 10`