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=-3a+b =(-15) =2a+b= 0 2a+b = 0 _ 2(3)+b = 0 =(3)(-5)+(-6)
-5a = -15 6 + b = 0 =(-15)+(-6)
a = -15 b = 0 - 6 = -15 - 6
-5 b = -6 = -21
a = 3
jawabannya -21 yang a.