Question

calcule a equaçao x+5=20\x+4

Answer 1

x + 5  =    20
               ------
               x + 4

(x + 5).(x + 4) = 20
x² + 4x + 5x + 20 = 20
x² + 9x = 20 - 20
x² + 9x = 0
x.(x + 9) = 0
x = 0

x + 9 = 0
x = - 9

R.: x = 0 e x = - 9