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180 derajat = 95derajat + (3x-5)+(x+10)
180derajat-95derajat= 3x+x-5+10
85derajat = 4x+5
85derajat-5 =4x
80 = 4x
20 =x
sudut BAC = 3x-5
=3 dikali 20 -5
= 60-5
= 55 derajat
jadi, besar sudut BAC adalah 55 derajat