Question

7 - Calcule a raiz ou solução das seguintes equações:
a) 3x + 6 = 9
b) 4x - 6 = 2x + 2-X
c)7x = 4x - 2+9
d)5x +3 = 2x 4+2
e) 7x - 3 + 1 = 2x + 4
f) 56 - 2x = 4x - 2
g) 4x + 43 = 3x - 23​

Answer 1

Seguem as respostas e resolução abaixo.

a)

$3x + 6 = 9$

$3x =9-6$

$3x=3$

$x=\dfrac{3}{3}$

$\boxed{x=1}$

b)

$4x - 6 = 2x + 2-x$

$4x-2x+x=2+6$

$3x=8$

$\boxed{x=\dfrac{8}{3}}$

c)

$7x = 4x - 2+9$

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

$3x=7$

$\boxed{x=\dfrac{7}{3}}$

d)

$5x +3 = 2x +4+2$

$5x-2x=4+2-3$

$3x=3$

$x=\dfrac{3}{3}$

$\boxed{x=1}$

e)

$7x - 3 + 1 = 2x + 4$

$7x-2x =4+3-1$

$5x=6$

$\boxed{x=\dfrac{6}{5} }$

f)

$56 - 2x = 4x - 2$

$-2x-4x=-2-56$

$-6x=-58 \quad .(-1)$

$6x=58$

$x=\dfrac{58}{6}$

$\boxed{x=\dfrac{29}{3}}$

g)

$4x + 43 = 3x - 23$

$4x-3x=-23-43$

$\boxed{x=-66}$

Bons estudos!

Equipe Brainly

Answer 2

Explicação passo a passo:

Explicação passo a passo:

a)

$3x + 6 = 9$

$3x=9-6$

$3x=3$

$x=\dfrac{3}{3}$

$\boxed{x=1}$

b)

$4x - 6 = 2x + 2-x$

$4x-2x+x=2+6$

$3x=8$

$\boxed{x=\dfrac{8}{3}}$

c)

$7x = 4x - 2+9$

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

$3x=7$

$\boxed{x=\dfrac{7}{3}}$

d)

$5x +3 = 2x + 4+2$

$5x-2x=-3+4+2$

$3x=3$

$x=\dfrac{3}{3}$

$\boxed{\boxed{x=1}}$

e)

$7x - 3 + 1 = 2x + 4$

$7x-2x=+3-1+4$

$5x=6$

$\boxed{x=\dfrac{6}{5}}$

f)

$56 - 2x = 4x - 2$

$-2x-4x=-2-56$

$-6x=-58\quad . (-1)$

$6x=58$

$\boxed{x=\dfrac{58}{6}}$

g)

$4x + 43 = 3x - 23$

$4x-3x=-23-43$

$\boxed{x=-66}$