Question

Calcule as equações a seguir, determinando o conjunto de cada uma.
a) 6x + x = 14, com U = N
b) x + 7 = 0, com U = N
c) 7x + 1 – 5x = 9, com U = 
d) 21x + 1 = 11x + 6, com U = Q
e) x – = –3, com U = Q
f) 4 . (x – 2) = 4 + 2 . (x – 1), com U = Q

Answer 1

a) 7x=14 -> x=7 ok
b) x=-7
c) 2x=8 -> x=4
d) 10x=5 -> x=1/2
e) -x=-3 -> x= 3 /1 = 1
f) 4x-4 =4+2x-2 -> 2x=-2 -> x=-1

ok

Answer 2

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