Question

Resolva as equações seguintes

Answer 1

Explicação passo-a-passo:

a)18=x+7

-x=7-18

-x=-11.(-1)

x=11

b)34=3x+7

-3x=7-34

-3x=27.(-1)

3x=27

x=27/3

X=9

c)-7x-6x+4=14-3x

-7x-6x+3x=14-4

-10x=10.(-1)

x=-10/10

x=-1

d)5-7x-6x=14-3x

-7x-6x+3x=14-5

-10x=9.(-1)

10x=-9

x=-10/9

x=1,11

e)3x+2x-5x+12=2x-7x-5x+8

3x+2x-5x-2x+7x+5x=8-12

10x=-4

x=-4/10

x=-0,4

f)3(x+5)=2(x-8)

3x+15=2x-16

3x-2x=-16-15

x=-31

g)3(2x+1)=4x+8

6x+3=4x+8

6x-4x=8-3

2x=5

x=5/2

x=2,5

h)5(x-1)=94-2(x+4)

5x-5=94-2x-8

5x+2x=94-8+5

7x=91

x=91/7

x=13

i)3(x-4)=80-2(3x+1)

3x-12=80-6x-2

3x+6x=80-2+12

9x=90

x=90/9

x=10