Question

Calcula:

7x - 2 (5 - x) = 3 + 5x - 2

Answer 1

7x-10+2x=1+5x
9x-10=1+5x
4x=11
x=11/4

Answer 2

Resolviendo paso a paso aplicando reglas matemáticas
7x - 2 (5 - x) = 3 + 5x - 2

7 x - 2 (5 - x) = 5 x + 1
-2 (5 - x) = 2 x - 10:
2 x - 10 + 7 x = 5 x + 1
2 x + 7 x = 9 x:
9 x - 10 = 5 x + 1
Resta 5 x de ambos lados:
(9 x - 5 x) - 10 = (5 x - 5 x) + 1
9 x - 5 x = 4 x:
4 x - 10 = (5 x - 5 x) + 1
5 x - 5 x = 0:
4 x - 10 = 1
Añadir 10 a ambos lados:
4 x + (10 - 10) = 1 + 10
10 - 10 = 0:
4 x = 1 + 10
1 + 10 = 11:
4 x = 11
Divide ambos lados de 4 x = 11 por 4:
(4 x)/4 = 11/4
4/4 = 1:
Respuesta : 
  x = 11/4

espero ayudarte ;)