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sudut 3x-5 dan y+25 membentuk sudut 180
jadi:
3x-5=2x+10
3x-2x=10+5
x=15
3x-5+(y+25)=180
3.(15)-5+(y+25)=180
45-5+(y+25)=180
40+y+25=180
y=180-40-25
y=115
x+y:
15+115:130