Question

Resuelva las siguientes ecuaciones de primer grado
a) 4 + 4x = 12
b) 4x + 3 = 21 – 2x
c) 18x – 2x +2 +6 = 15x + 12
d) 5x + 1 = 3x – 4

Answer 1

a)

$4 + 4x = 12 \\ 4x = 12 - 4 \\ 4x = 8 \\ x = 2$

b)

$4x + 3 = 21 - 2x \\ 4x + 2x = 21 - 3 \\ 6x = 18 \\ x = 3$

c)

$18x - 2x + 2 + 6 = 15x + 12 \\ 16x + 8 = 15x + 12 \\ 16x - 15x = 12 - 8 \\ x = 12 - 8 \\ x = 4$