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2.) -9 + y = 8 --> y = 8 + 9 = 17 ; x + -2 = -3 --> x = -3 + 2 = -1
3.) 2a + -9 = 5 --> a = (5 +9)/2 = 7 ; 13 + 7 = 4b --> b = (13 + 7)/4 = 5
sisanya bisa lah yaa :)