Question

Calcule : a-) 2+x=7 b-) 5x=50 c-) -7x=42 d-) 3x-24=0 e-) x+2x=18

Answer 1

a)
$2 + x = 7 \\ x = 7 - 2 \\ x = 5$
b)
$5x = 50 \\ x = \frac{50}{5} \\ x = 10$
c)
$- 7x = 42 \\ x = \frac{42}{ - 7} \\ x = - 6$
d)
$3x - 24 = 0 \\ 3x = 24 \\ x = \frac{24}{3} \\ x = 8$
e)
$x + 2x = 18 \\ 3x = 18 \\ x = \frac{18}{3} \\ x = 6$