Question

Resolva as equações:
a)x-3=7
b)x+4=10
c)x+101=300
d)x-279=237
e)x-8=-10
f)x+9=-1
g)3x=12
h)9x=18
i)35x=-105
j)7x-1=13
k)6x-10=2x+14
l)6x=2x+28
m)3(x+2)=15
n)2(x-1)-7=16
o)7(x-2)=5(x+3)
p)2(x-6)=-3(5+x)
q)x/2+x/4= 1/2
r)x/2-x/4=5

Answer 1

a) x - 3 = 7
    x = 7 + 3
    x = 10

b) x + 4 = 10
   x = 10 - 4
   x = 6

c) x + 101 = 300
    x = 300 - 101
    x = 199

d) x - 279 = 237
    x = 237 + 279
   x = 516

e) x - 8 = - 10
    x = - 10 + 8
    x =  - 2

f) x + 9 = - 1
   x = - 1 - 9
   x = - 10

g) 3x = 12
     x = 12/3
      x = 4

h) 9x = 18
     x = 18/9
     x = 2

i)
35x = - 105
x = - 105/35
x = - 3

j)
7x - 1 = 13
7x = 13 + 1
7x = 14
x = 14/7
x = 2

k)
6x - 10 = 2x + 14
6x - 2x = 14 + 10
4x = 24
x = 24/4
x = 6

l)
6x = 2x + 28
6x - 2x = 28
4x = 28
x = 28/4
x = 7

m)
3 (x + 2) = 15
3x + 6 = 15
3x = 15 - 6
3x = 9
x = 9/3
x = 3

n)
2(x - 1) - 7 = 16
2x - 2 - 7 = 16
2x - 9 = 16
2x = 16 + 9
2x = 25
x = 25/2

o)
7(x-2) = 5(x + 3)
7x - 14 = 5x + 15
7x - 5x = 15 + 14
2x = 29
x = 29/2

p)
2(x - 6) = - 3(5 + x)
2x - 12 = -15 - 3x
2x + 3x = - 15 + 12
5x = - 3
x = - 3/5

q)
x + x =  1
2    4     2

mmc: 2 e 4 = 4

2x + x   =   2   
   4            4
3x = 2
x = 2/3

r)
x - x = 5
2   4 

mmc: 2 e 4 = 4

2x - x = 20
   4        4
2x - x = 20
x = 20