Question

Resolva as equações:
7) 30x - 6 = 12x
8) 5x = -9x + 28
9) 4( x – 2 )= 3x - 12

Answer 1

Resposta:

7) 30x - 6 = 12x

30x - 12x = 6

18x = 6

x = 3

8) 5x = -9x + 28

5x + 9x = 28

14x = 28

x = 2

9) 4(x - 2) = 3x - 12

4x - 8 = 3x - 12

4x - 3x = -12 + 8

x = -4

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