Question

Resolva as seguintes equações:

a) 5x - 3 = 2c +12
b) x = 7
²
c) 2x- 7x - 3 + 9 = - 14

Answer 1

a) 5x - 3 = 2c +12 ==> 5x - 2x = 12 + 3 ==> 3x = 15 ==> x = 5

b) x = 7^2 ==> x = 49

c) 2x- 7x - 3 + 9 = - 14 ==> - 5x = -14- 6 ==> -5x=-20(-1)=> 5x = 20 => x = 4