Question

resolva as equações



POR FAVOR ME AJUDEM !!!!!!!​

Answer 1

a) x+30=40

x=40-30

x= -10

b) 30-20+2x=10

2x= 10-30+20

2x=-20+20

2x= 0

c) 3x-10+13=-2x+28

3x+2x= 28+10-13

5x= 38-13

5x=25

x= 25

     5

x =5

d)20x-30=40+30-20

20x= 40+30-20+30

20x=70+10

20x=80

x=80

   20

x=4

e)-5x+45-80=-90+41

-5x= -90+41-45+80

-5x= -49 + 35

-5x= - 14 (-1)

5x= 14

x= 14

    5  

f) 10x-20=40+50

10x= 40+50+20

10x=90+20

10x= 110

x= 110

      10

x= 11

g) 20-80+2x=10

2x= 10-20+80

2x= -10+80

2x= 70

x=70

    2

x=35

h)19+2x-13=10-20

2x=10-20-19+13

2x= -10-6

2x= -16

x= -16

     2

x= -8

i) 10x-12+10=18-20

10x= 18-20+12-10

10x= -2+ 2

10x=0

j)13x-23-45=-7x+12

13x+7x= 12+23+45

20x=35+45

20x= 80

x= 80

    20

x=4