Question

Resolva as equações
a)6x=2×+16
b) 2×-5=×+1
c)5×+7=4×+10
d)9×+9+3×=15
e)×+2×+3-5×=4×-9
f)4×-1=3(×-1)
g)7(×-4)=2×-3
h)3(3×-1)=2(3×+2)
i)5×-3(×+2)=15
j)2×+3×+9=8(6=-×)

Answer 1

Resolva as equações:

a)
6x=2×+16
6x - 2x = 16
4x = 16
x = 16/4
x = 4

b)
2×-5=×+1
2x - x = 1 + 5
x = 6

c)
5×+7=4×+10
5x - 4x = 10 - 7
x = 3

d)
9×+9+3×=15
12x + 9 = 15
12x = 15 - 9
12x = 6
x = 6/12 (:6)/(:6)
x = 1/2

e)
×+2×+3-5×=4×-9
- 2x + 3 = 4x - 9
3 + 9 = 4x + 2x
12 = 6x
6x = 12
x = 12/6
x = 2

f)
4×-1=3(×-1)
4x - 1 = 3x - 3
4x - 3x = - 3 + 1
x = - 2

g)
7(×-4)=2×-3
7x - 28 = 2x - 3
7x - 2x = - 3 + 28
5x = 25
x = 25/5
x = 5

h)
3(3×-1)=2(3×+2)
9x - 3 = 6x + 4
9x - 6x = 4 + 3
3x = 7
x = 7/3

i)
5×-3(×+2)=15
5x - 3x - 6 = 15
2x - 6 = 15
2x = 15 + 6
2x = 21
x = 21/2

j)
2×+3×+9=8.(6-×)
5x + 9 = 48 - 8x
8x + 15x = 48 - 9
23x = 39
x = 39/23