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3x+2y + x = 180
3x+x+x= 180
3x+2x = 180
5x = 180
x= 180/5 = 36 derajat
2y = x
2y= 36
y= 36/2
y= 18 derajat
Kalau salah maaf
dan diketahui bahwa x = 2y
3x + 2y + x = 180
4x + 2y = 180
4(2y) + 2y = 180
8y + 2y = 180
10y = 180
y = 18
maka
a) nilai x = 2y = 2 x 18 = 36
b) nilai y = 18
c) nilai x - y = 36 - 18 = 18