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x = 2y - 5
x - 2y = -5
koefisien x = 1 dan koefisien y = -2
b)
x+3y+1=0
x + 3y = -1
koefisien x = 1 dan koefisien y = 3
c)
3x-1=2y
3x - 2y = 1
koefisien x = 3 dan koefisien y = -2
d)
y = 1/2x - 2
-1/2x + y = -2
koefisien x = -1/2 dan koefisien y = 1