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x+4 = y
z-17 = x maka z =x+17
masukan dalam persamaan awal
x+y+z=45
x+x+4+x+17 = 45
3x =45-21
3x = 24
x =8
z =x+17
z = 8 + 17 = 25
x+4 = y
8+4= y
y =12
semoga membantu
a + b + c = 45
a + 4 = b
c - 17 = a ⇒⇒ c = a + 17
subsitusikan k persamaan I
a + b + c = 45
a + a + 4 + a + 17 = 45
3a + 21 = 45
3a = 24
a=8
b = a + 4 = 8 + 4 =12
c = a + 17 = 8 + 17 = 25