Question

Resolva as equações abaixo

2x+5=x-3

8x-7=3x+8

4x-12=x+3

6x+9=3x+15

7x-10=4x-3

Answer 1

A)2x+5=x-3
2x-x+5+3
x+8
B= 1   C=8

B)8x-7=3x+8
8x-3x-7-8
5x-15
B= 5  C=-15

C)4x-12=x+3
4x-x-12-3
3x-15
B=3  C=-15

D)6x+9=3x+15
6x-3x+9-15
3x-6
B=3  C=-6

E)7x-10=4x-3
7x-4x-10+3
3x-7
B=3  C=-7

Answer 2

a) 2x + 5 = x - 3
2x - x = - 5 - 3
x = - 8

b) 8x - 7 = 3x + 8
8x - 3x = 7 + 8
5x = 15
x = 3

c) 4x - 12 = x + 3
4x - x = 12 + 3
3x = 15
x = 5

d) 6x + 9 = 3x + 15
6x - 3x = 15 - 9
3x = 6
x = 2

e) 7x - 10 = 4x - 3
7x - 4x = 10 - 3
3x = 7
x = 7/3