Question

Resolva as equações:
a) 5+ 3x - 7= x + 20
b) 2x- 4 + 3x = 7 + x +9
c ) -x+6 - 2x = 2x-9
COLOQUEM AS CONTAS PFV​

Answer 1

Olá!!!

Resposta...

____________________

$=5+3x-7=x+20$

$=3x-2=x+20$

$=3x=x+22$

$=2x=22$

$=\dfrac{2x}{2}=\dfrac{22}{2}$

$\bf x=11$

____________________

$=2x-4+3x=7+x+9$

$=5x-4=7+x+9$

$=5x-4=x+16$

$=5x=x+20$

$=4x=20$

$=\dfrac{4x}{4}=\dfrac{20}{4}$

$\bf x=5$

____________________

$=-x+6-2x=2x-9$

$=-3x+6-6=2x-9-6$

$=-3x=2x-15$

$=-5x=-15$

$=\dfrac{-5x}{-5}=\dfrac{-15}{-5}$

$\bf x=3$