Question

hallar el valor de x
a) 20x-12=10x+8

b)15x-10=5x+20

c) 12x-8=2x+2

Answer 1

Respuesta:

a) 20x-12=10x+8

$20x - 12 = 10x + 8 \\ 20x - 10x = 8 + 12 \\ 10x = 20 \\ x = 20 \div 10 \\ x = 2$

Probamos

$20x - 12 = 10x + 8 \\ 20(2) - 12 = 10(2) + 8 \\ 40 - 12 = 20 + 8 \\ 28 = 28$

b) 15x-10=5x+20

$15x - 10 = 5x + 20 \\ 15x - 5x = 20 + 10 \\ 10x = 30 \\ x = 30 \div 10 \\ x = 3$

Probamos

$15x - 10 = 5x + 20 \\ 15(3) - 10 = 5(3) + 20 \\ 45 - 10 = 15 + 20 \\ 35 = 35$

C) 12x-8=2x+2

$12x - 8 = 2x + 2 \\ 12x - 2x = 2 + 8 \\ 10x = 10 \\ x = 10 \div 10 \\ x = 1$

Probamos

$12x - 8 = 2x + 2 \\ 12(1) - 8 = 2(1) + 2 \\ 12 - 8 = 2 + 2 \\ 4 = 4$

Espero te sirva