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uang Haikal = x
uang Theo = y
maka
x = 5y
x-2.800 = y+2.800
x-2.800-2.800 = y
x-5.600 = y
x = 5y
x = 5(x-5.600)
x = 5x-28.000
x-5x = -28.000
-4x = -28.000
4x = 28.000
x = 28.000/4
x = 7.000
uang Haikal = 7.000
uang Theo = 1.400
7.000-2.800 = 1.400+2.800
4.200 = 4.200