Question

Resolva as equações
a)6(x+3)-2 (x+5)=20
b)2(x-7)-4 (5-x)=2
c)2 (x+3)=30
d)2x-1 =x-1
5 4 10

Answer 1

a) 6 (x + 3) - 2(x + 5) = 20
6x + 18 - 2x - 10 = 20
4x = 20 - 18
4x = 2
x = 4 ÷ 2
x = 0,5

b) 2(x - 7) -4 (5 - x) = 2
2x - 14 - 20 + 4x = 2
6x = 2 + 34
6x = 36
x = 36 ÷ 6
x = 6

c) 2 (x + 3) = 30
2x + 6 = 30
2x = 30 - 6
2x = 24
x = 24 ÷ 2
x = 12

d) 2x - 1 = x - 1
2x - x = -1 + 1
x = 0

Answer 2

Resolva as equações

a)
6(x+3)-2 (x+5)=20
6x + 18 - 2x - 10 =20
4x + 8 = 20
4x = 20 - 8
4x = 12
x=12/4
x=3

b)
2(x-7)-4 (5-x)=2
2x-14-20+4x=2
6x-34=2
6x=2+34
6x=36
x=36/6
x=6

c)

2 (x+3)=30
2x+6=30
2x=30-6
2x=24
x=24/2
x=12

d)
2x-1 =x-1
2x-x= -1 +1
x=0

5 4 10