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x + y = z
-------------- (+)
4x = 7 + z
x = 7+z / 4
x + z = 7
7+z / 4 + z = 7
------------------------ (kedua ruas kalikan 4)
7 + z + 4z = 28
5z = 21
z = 4,2
x = 7+4,2 / 4
x = 2,8
x + y = z
2,8 + y = 4,2
y = 1,4
HP =
x = 2,8
y = 1,4
z = 4,2