Question

Alguem pode resolver essas expressões com conta para mim ?

Answer 1

a)
2x + 6 = 30
2x = 30 - 6
2x = 24
x = 24/2 = 12

b)
8 - 2x - 10 = 5 + 6x + 12
-2x - 2 = 17 + 6x
-2x - 6x = 17 + 2
-8x = 19
x = - 19/ 8

c)
3y - 3 - 4y - 8 = 6
-y + 5 = 6
-y = 6-5
-y = 1 (×-1)
y = -1

d)
10y + 2 = 27
10y = 27 - 2
10y = 25
y = 25/ 10 (÷5)
y = 5/2

e)
2y - 3y + 3 = 8 - 2y + 4
-x + 3 = 12 - 2x
-x + 2x = 12 - 3
x= 9

f)
6x - 5 + 5x = 10x + 6
11x - 5 = 10x + 6
11x - 10x = 6 + 5
x = 11

g)
6x + 12 = 4x + 24
6x - 4x = 24 - 12
2x = 12
x = 6

h)
4x - 10x - 10 - 2x + 4 = 0
- 8x - 6 = 0
- 8x = 6
x = - 6/8

i)
2x - 2 = 5x - 6x + 12
2x - 2 = -x + 12
2x + x = 12 + 2
3x = 14
x = 14/3

j)
7x + 5x - 10 + 3x + 12 = 0
15x + 2 = 0
15x = - 2
x = - 2/15