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180= 2y+120
180-120=2y
y= 60/2 =30
180=105+(x-20)+(x+5)
180=2x+90
180-90=2x
x= 90/2= 45
x+y= 30+45 = 75(D)
y+25 + y-10 + 105 = 180
2y + 120 = 180
2y = 180 - 120
2y = 60
y = 60/2
y = 30 derajat
sudut BCD + sudutCDB + sudutDBC=180derajat
x-20 + x + 5 +105 = 180
2x + 90 = 180
2x = 180 - 90
2x = 90
x = 90/2
x = 45 derajat
x + y = 30 + 45 = 75 derajat
d. 75 derajat