Question

Resolva as equações:

a) 5x + 2 = 20 + 3x

b) 3. (x+2) = 15

c) 3 (2x - 1) = 20 + 4x​

Answer 1

a) 5x + 2 = 20 + 3x
5x - 3x = 20 - 2
2x = 18
x = 18/2
x = 9

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

c) 3 ( 2x - 1 ) = 20 + 4x
6x - 3 = 20 + 4x
6x - 4x = 20 + 3
2x = 23
x = 23/2
x = 11,5