Question

Ex 5: Encontre a raiz de cada equação:
a) 5x + 3 = 4x +9
b) 2.( x + 1) = 4x +5

Answer 1

a)

$5x + 3 = 4x + 9 \\ 5x - 4x = 9 - 3 \\ x = 6$

b)

$2(x + 1) = 4x + 5 \\ 2x + 2 = 4x + 5 \\ 2x - 4x = 5 - 2 \\ - 2x = 3 ( - 1) \\ 2x = - 3 \\ x = - \frac{3}{2} \\ x = - 1.5$