1) x + 3 = 12 a) x = 15 b) x = 9 c) x = 6 2) x + 5 = 9 a) x = 4 b) x =14 c) x = 1 3) x - 2 = 8 a) x = 6 b) x = 10 c) x = 4 4) x - 7 = 11 a) x = 18 b) x = 4 c) x = 3 5) x - 9 = 0 a) x = 0 b) x = 18 c) x = 9 6) x + 5 =15 a) x = 10 b) x = 7 c) x = 3 7) 4 + x = 4 a) x = 8 b) x = 0 c) x = 4 8) 11 + x = 20 a) x = 3 b) x = 9 c) x= 19 9) 2x = 4 a) x = 8 b) x = 2 c) x = 10 10) 3x = 18 a) x = 6 b) x = 3 c) x = 2 11) 5x = 15 a) x = 20 b) x = 3 c) x = 5 12) 7x = 70 a) x = 1 b) x =11 c) x = 10 13) 2x = 5 a) x = 2.5 b) x = 10 c) 2.5 14) 10x = 18 a) x =180 b) 1.8 c) x = 1.8 15) 30x = 0 a) x =1 b) x =0 c) 0

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