Question

resolva as equações e obtenha a solução de cada umas suas incógnitas:
a)x - 5 = -7

b)y - 6 = 5y + 8

c)10 x = 20 + 9x

d) 2 x + 5 - X = 5 - 3 x

e) 2 m + 6 = m

1) 2 x + 1 = 15

g) 5 - X - 20 = 5x - 10 - 7 x

h) x + 6 = 2-3x​

Answer 1

a)x-5=-7

x=-7+5

x=-2

b)y-6=5y+8

y-5y=8+6

-4y=14 (-1)

4y=-14

y= -14/4

y=-3.5

c)10x=20+9x

10x-9x=20

x=20

d)2x+5-x=5-3x

2x+3x-x=5-5

4x=0

x=4

e) 2m+6=m

2m-m=-6

m=-6

f)2x+1=15

2x=15-1

2x=14

x=14/2

x=7

g)5-x-20=5x-10-7x

5+10-20=5x+x-7x

15-20=6x-7x

-5=-x (-1)

5=x

h) x+6=2-3x

x+3x=2-6

4x=-4

x=-4/4

x=-1