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2x-3 = 3
x = 3 --> (3,3)
nilai b :
2x-3 = -5
x = -1 --> (-1,-5)
nilai c :
2(2)-3 = 1 --> (2,1)
nilai d :
2(-1)-3 = -5 --> (-1,-5)
maka a+b+c+d = 3-1+1-5 = -2