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4x + 10 + 5x - 30 + 6x - 40 = 180
15x = 240
x = 16
A = 4 x 16 + 10 = 74 (terbesar)
B = 5 x 16 - 30 = 50
c = 6 x 16 - 40 = 46
15x - 60 = 180
15x = 240
x = 16
lalu gunakan substitusi
sudut A = 4(16) + 10
= 64 + 10
= 74 derajat
sudut B = 5(16) - 30
= 80 - 30
= 50 derajat
sudut C = 6(16) - 40
= 96 - 40
= 56 derajat
sudut terbesar adalah sudut A
sisi terpanjang adalah sisi BC