Question

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Resolva as equações:

a)x+5=12
b)x-12=15
c)2x=8
d)5x=90
e)2.(x+6)=30
f)4.(x+3)=20
g)3x-4=11
h)4x+9=3x+5
i)5x+4-2x=26-3x
j)x/2-8=1

Answer 1

a) x+5 = 12   =>   x = 12-5   =>   x = 7
b) x-12 = 15   =>   x = 15+12   =>   x = 27
c) 2x = 8   =>   x = 8/2   =>   x=4
d)5x = 90   =>   x = 90/5  =>   x = 18
e)2.(x+6) = 30   =>   2x+12 = 30   =>   2x = 30-12   =>   x = 18/2   =>   x = 9 
f)4.(x+3) = 20   =>   4x+12 = 20   =>   4x = 20-12   =>   x = 8/4   =>   x = 2
g)3x-4 = 11   =>   3x = 15   =>   x = 15/3   =>   x = 5
h)4x+9 = 3x+5   4x-3x = 5-9   =>   x = -40
i)5x+4-2x = 26-3x   =>   5x-2x+3x = 26-4   =>   6x = 22   =>   x = 22/6 ou 11/3
j)x/2-8 = 1   x/-6 = 1   =>   x = 1*(-6)   =>   x = -6

Answer 2

a)
x+5=12
x=12-5
x=7

b)
x-12=15
x=15+12
x=27

c)
2x=8
x=8/2
x=4

d)
5x=90
x=90/5
x=18

e)
2. (x+6)=30
2x +12 =30
2x=30-12
2x=18
x=18/2
x=9

f)
4. (x+3)=20
4x+12=20
4x=20-12
4x=8
x=8/4
x=2

g )
3x-4=11
3x=11+4
3x= 15
x=15/3
x=5

h)
4x+9=3x+5
4x-3x=5-9
x=-4

i)
5x+4-2x=26-3x
5x-2x+3x=26-4
6x=22
x=22/6
x=3,666666

j)
x/2-8=1
x/2=1-8
x/2=-7
x=-7.2
x=-14