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(2 - 25) + (3 + 5) = 180
5 - 20 = 180
5 = 200
=
2 = 2(40)
2 =
jadi jika dijmlh 180 derajat.
2x - 25 + 3x +5 = 180
5x - 20 = 180
5x = 180 +20
5x = 200
x = 200/5
x = 40 derajat
nilai 2x = 2 . 40
= 80 derajat