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5x + 25 = 180
5x = 155
x = 31
pelurus KLN
2(31) + 10
= 62+10= 72 derajat
3x+15 + 2x + 10 = 180 (knp 180? karena dia berpelurus)
5x + 25 = 180
5x = 180-25
5x = 155
x = 31
setelah kita tau x-nya, subtitusi-in ke pelurusnya KLN
2x + 10
2(31) + 10
62 + 10
72