Question

resolva as seguintes equaçoes do 1° grau:a)2x+5=x+1 b)-x+3=-2 c)12x-3=x+8 d)2x-x=3x+6 e)x+1-x=5 f)2x-x=3 g)x-x=3x+6 h)5x-4x=-x+6

Answer 1

a) 
2x + 5 = x + 1
2x - x = 1 - 5
x = - 4

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

c)
12x - 3 = x + 8
12x - x = 8 + 3
11x = 11
x = 11/11
x = 1

d)
2x - x = 3x + 6
2x - x - 3x = 6
- 2x = 6
x = - 6/2
x = - 3

e)
x + 1 - x = 5
x - x = 5 - 1
0 = 4

f)
2x - x = 3
x = 3

g)
x - x = 3x + 6
x - x - 3x = 6
- 3x = 6
x = - 6/3
x = - 2

h)
5x - 4x = - x + 6
5x - 4x + x = 6
2x = 6
x = 6/2
x = 3