Question

Resolva as equações:

A) 13(2x – 3) – 5(2 . x) = 5(-3 + 6x)

B) 2(2x + 7) + 3(3 – 5) 3 = 4x + 5 – 1

C) 2 – 7(1 – 2x) = 5- (x + 9)

D) ( 1 + 3x ) – (1 -2x) + (-11 – 7x) = 5

Answer 1

Resposta:

A) $-\frac{12}{7}$

B) 0

C) $\frac{1}{15}$

D) x = -8

Explicação passo-a-passo:

A)

$13(2x-3)-5*(2x)=5(-3+6x)\\26x-39-5*2x=-15+30x\\26x-39-10x=-15+30x\\16x-39=-15+30x\\16x-30x=-15+39\\-14x=24\\x=\frac{12}{7}$

B)

$2(2x + 7) + 3(3 – 5) 3 = 4x + 5 – 1\\4x+14+3*(-2)*3=4x+5-1\\4x+14-18=4x+5-1\\14-18=5-1\\-4=4\\x=0$

C)

$2- 7(1- 2x) = 5- (x + 9)2-7+14x=5-x-9\\-5+14x=-4-x\\14x+x=4+5\\15x=1\\x=\frac{1}{15}$

D)

$( 1 + 3x )-(1-2x)+(-11-7x) = 5\\1+3x-1+2x-11-7x=5\\-2x-11=5\\-2x=5+11\\-2x=16\\x=-8$