Question

Al suprimir paréntesis en: 4x+[x-(2x-3)]-[5-2(1-x)] el resultado es:

A) -x
B) x
C) 2x
D) -2x

Answer 1

$4x+[(x-(2x-3)]-[5-2(1-x)]\\ =4x+[x-2x+3]-[5-2+2x]\\ =4x+x-2x+3-5+2-2x\\ =(4x+x-2x-2x)+(3-5+2)\\ =x\\ \\ \\B) \, x$

Answer 2

$4x+[(x-(2x-3)]-[5-2(1-x)]\\ =4x+[x-2x+3]-[5-2+2x]\\ =4x+x-2x+3-5+2-2x\\ =(4x+x-2x-2x)+(3-5+2)\\ =x\\ \\ \\B) \, x$