Question

b) 73x + 100 = 53x
a) 21x - 17 = 109
c) 1,7 + 2,5x = 4,2
d) 23x - 22 = 19x + 6
e) 12x – 16 = -21 + 10%​

Answer 1

Resposta:

$73x - 53x = - 100 \\ 20x = - 100 \\ x = \frac{ - 100}{20} \\ x = - 5$

$21x = 109 + 17 \\ 21x =1 26 \\ x = \frac{126}{21} \\ x = 6$

$2.5x = 4.2 - 1.7 \\ 2.5x = 2.5 \\ x = \frac{2.5}{2.5} \\ x = 1$

$23x - 19x = 6 + 22 \\ 4x = 28 \\ x = \frac{28}{4} \\ x = 7$

$12x = - 21 + 10 + 16 \\ 12x = - 11 + 16 \\ 12x = + 5 \\ x = \frac{12}{5}$