Question

resolva as equações
5x -7 = 3x + 15
3x -4 = 2x + 10
2x -3 = 7(x - 4)​

Answer 1

Resposta:

5x -7 = 3x + 15

$5x - 7 - 3x - 15 = 0 \\ 2x - 22 = 0 \\ 2x = 22 \div 2 \\ x = 11$

3x -4 = 2x + 10

$3x - 4 - 2x - 10 = 0 \\ x - 14 = 0 \\ x = 14$

2x -3 = 7(x - 4)

$2x - 3 = 7x - 28 \\ 2x - 3 - 7x + 28 = 0 \\ - 5x + 25 = 0 \\ - 5x = - 25 \times ( - 1) \\ 5x = 25 \div 5 \\ x = 5$