Question

Observe o exemplo resolva as equações sendo x um número racional

A)12x - 4 = 10x + 3
B)5x - 2 = -3x + 3 + 2x
C) 9 - x + 2 = -5x + 3 + 2x
D) -x - 2x - 4 = 11

Answer 1

A) 12x - 4 = 10x +3
12x = 10x + 3 + 4
12x = 10x + 7
12x - 10x = 7
2x = 7
x = 7/2 = 3,5

B) 5x -2 = -3x + 3 + 2x
5x -2 = -1x + 3
5x = -1x + 3 + 2
5x + 1x = 5
6x = 5
x = 6/5 = 1,2

C) 9 -x + 2 = -5x + 3 + 2x
11 = - 5x + 3 + 2x + x
11 -3 = - 5x + 2x + x
8 = - 5x + 3x
8 = -2x
x = 8/-2 = -4

D) -x - 2x - 4 = 11
-3x -4 = 11
-3x = 11 + 4
-3x = 15
x = 15/-3 = -5