Question

qual valor de 7x+4-5x=30

Answer 1

7x+4-5x=30
7x-5x=30-4
2x=26
x=26/2
x=13

Answer 2

$7x+4-5x=30\to \\\\ 7x-5x=30-4\to \\\\ 2x=26\to \\\\ x= \frac{26}{2} \to \\\\ x=13$