Determine a raiz ou solucao das equacoes
a) 5x-7=3x-10
b) 15x - 13 = -39 - 11x
c) 7x+11=15+5x
d) 7,2x-0,48=0,48+4,8x
e) 21+9x=15x+33
f) 2x + 0,8 - 3,5 = x
g) 16-11x+12=-15x
h) 23-2x=x+25
a) 5x-7=3x-10
b) 15x - 13 = -39 - 11x
c) 7x+11=15+5x
d) 7,2x-0,48=0,48+4,8x
e) 21+9x=15x+33
f) 2x + 0,8 - 3,5 = x
g) 16-11x+12=-15x
h) 23-2x=x+25
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Verified answer
Determine a raiz ou solução das equações:
a)
5x - 7 = 3x - 10
5x - 3x = - 10 + 7
2x = - 3
x = - 3/2
b)
15x - 13 = - 39 - 11x
15x + 11x = - 39 + 13
26x = - 26
x = - 26/26
x = - 1
c)
7x + 11 = 15 + 5x
7x - 5x = 15 - 11
2x = 4
x = 4/2
x = 2
d)
7,2x - 0,48 = 0,48+4,8x
7,2x - 4,8x = 0,48 + 0,48
2,4 x = 0,96
x = 0,96/2,4 . (100)/(100)
x = 96/240 (:48)/(:48)
x = 2/5
e)
21 + 9x = 15x + 33
21 - 33 = 15x - 9x
- 12 = 6x
6x = - 12
x = - 12/6
x = - 2
f)
2x + 0,8 - 3,5 = x
2x - 2,7 = x
2x - x = 2,7
x = 2,7
g)
16 - 11x + 12= - 15x
28 - 11x = - 15x
15x - 11x = - 28
4x = - 28
x = - 28/4
x = - 7
h)
23 - 2x = x + 25
23 - 25 = x + 2x
- 2 = 3x
3x = - 2
x = - 2/3