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x=40-y
5000x+2000t=115000
5000(40-y)+2000y=115000
200000-5000y+2000y=115000
-5000y+2000y=115000-200000
-3000y=-85000
y=-85000/-3000
y=85/3
x=40-y
x=40 - 85/3
x=120/3 - 85/3
x=35/3
jadi nilai x = 35/3
dan nilaiy =85/3