1) 2 - x = 0 a) x = 5 b) x = 15 c) x = 14 d) x = 2 2) 12 - x = 7 a) x = 15 b) x = 10 c) x = 5 d) x = 12 3) 12 - x = 6 a) x = 10 b) x= 6 c) x = 14 d) x = 12 4) x - 4 = 8 a) x = 12 b) x = 13 c) x= 6 d) x = 4 5) x - 5 = 9 a) x = 14 b) x= 6 c) x = 3 d) x = 12 6) x - 2 = 13 a) x = 10 b) x = 2 c) x = 15 d) x = 5 7) 19 - 6 = x a) x = 13 b) x = 15 c) x= 6 d) x = 5 8) 17 - 7 = x a) x = 5 b) x = 10 c) x= 6 d) x = 2 9) 2x + 7 = 13 a) x = 4 b) x = 3 c) x = 5 d) x= 6 10) 3x + 6 = 18 a) x = 15 b) x = 4 c) x = 3 d) x = 12 11) 2x = 24 a) 2 b) 12 c) 6 d) -12 12) 3x=-30 a) 10 b) 0 c) -10 d) -5 13) 5x = -45 a) 8 b) 9 c) -11 d) -9 14) 10 - x = 45 a) 55 b) - 35 c) - 25 d) 35 15) -2x = 40 a) -20 b) -10 c) 10 d) 20 16) 3x = -45 a) 12 b) 13 c) -15 d) -13 17) x + 25 = 2x a) 10 b) 12 c) 15 d) 25 18) x- (-6 ) = 10 a) 4 b) -4 c) 16 d) -16 19) x/5 = 7 a) 12 b) 35 c) 14 d) 5 20) x/10 = 100 a) 100 b) 1000 c) 10000 d) 100000

Encontrando o valor desconhecido - Fran

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