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x+(x+15)= 50
2x+15=50
2x= 50-15
A+D= 50
D=50-A
A-5=3D-15
A-5=3(50-A)-15
A-5=150-3A-15
4A=15--10=140
A=140:4=35
umr anggit = 35 TH