Question

Resolva:

a)12x-10=5x+11

b)7x+5=68-2x

c)2(7x+2)+12(x+1)=2

d)-2(y-3)=18

e)4(y-1)-2(3y+4)=6

f)3(2x-5)=9-2x

g)10-4x=9+2x

h)2(7x+2)+12(x+1)=1

i)-2(x-3)=18

j)4(a-1)-2(3a+4)=6​



alguém me ajuda por favooor

Answer 1

Explicação passo a passo:

a)12x-10=5x+11

  12x-5x = 11+10

  7x = 21

   $x=\frac{21}{7}$

   x=3

b)7x+5=68-2x

  7x+2x = 68-5

  9x = 63

  $x=\frac{63}{9}$

  x = 7

c)2(7x+2)+12(x+1)=2

  14x+4+12x+12 = 2

  14x+12x = 2-4-12

  26x = -14

  $x=-\frac{14}{26}$

d)-2(y-3)=18

  -2y+6 = 18

  -2y = 18-6

  -2y = 12 .(-1)

  2y = -12

  $y=-\frac{12}{2\\}$

  y = -6

e)4(y-1)-2(3y+4)=6    

  4y-4-6y-8 = 6

  4y-6y = 6+4+8

  -2y = 18 .(-1)

  2y = -18

  $y=-\frac{18}{2}$

  y = -9

f)3(2x-5)=9-2x

 6x-15 = 9-2x

 6x+2x = 9+15

 8x = 24

  $x=\frac{24}{8}$

  x = 3

g)10-4x=9+2x

  -4x-2x = 9-10

  -6x = -1 .(-1)

  6x = 1

  $x=\frac{1}{6}$

h)2(7x+2)+12(x+1)=1

  14x+4+12x+12 = 1

  14x+12x = 1-4-12

  26x = -15

  $x=-\frac{15}{26}$

i)-2(x-3)=18

 -2x+6 = 18

  -2x = 18-6

  -2x = 12 .(-1)

  2x = -12

  $x=-\frac{12}{2\\}$

  x = -6

j)4(a-1)-2(3a+4)=6

4a-4-6a-8 = 6

4a-6a = 6+4+8

-2a = 18 .(-1)

 2a = -18

  $a=-\frac{18}{2}$

  a = -9