Question

resolva:
a)12x=2x+20
b)14 - 2y + 2y = 40
c)16x=42 + 6x

Answer 1

a)
12x - 2x = 20
10x = 20
x = 20/10 = 2

b) impossível

c)
16x - 6x = 42
10x = 42
x = 42/10 = 21/5 = 4,2