Question

me ajudem pfv! preciso da conta!

e) (X+3)=(-X-1)=

g) 6X+3=3X+18=

h) 8(X+3)=12(1-X)=

i) (X+10)=(-X+6)=

j) 2X-18=4X-38=

k) 4X=2(X+10)=

l) 11X=3X+400=

Answer 1

e)

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

$x = - \frac{4}{2} \\ x = - 2$

g)

$6x + 3 = 3x + 18 \\ 6x - 3x = 18 - 3 \\ 3x = 15$

$x = \frac{15}{3} \\ x = 5$

h)

$8(x + 3) = 12(1 - x) \\ 8x + 24 = 12 - 12x \\ 8x + 12x = 12 - 24$

$20x = - 12 \\ x = - \frac{12}{20}$

$x = - \frac{3}{5} = - 0.6$

i)

$x + 10 = - x + 6 \\ x + x = 6 - 10 \\ 2x = - 4$

$x = - \frac{4}{2} \\ x = - 2$

j)

$2x - 18 = 4x - 38 \\ 2x - 4x = - 38 + 18 \\ - 2x = - 20 \: (. - 1)$

$x = \frac{20}{2} \\ x = 10$

k)

$4x = 2(x + 10) \\ 4x = 2x + 20 \\ 4x - 2x = 20 \\ 2x = 20 \\ x = \frac{20}{2} = x = 10$

l)

$11x = 3x + 400 \\ 11x - 3x = 400 \\ 8x = 400 \\ x = \frac{400}{8} \\ x = 50$