Question

qual o valor de x: 7x-1=9x

Answer 1

7x-1=9x

7x-9x=1
-2x=1
x=1+2
x=3

Answer 2

7x -1 = 9x 7x -9x = +1 -2x = +1 x = +1 (-1) -1 -2x (-1) +2x V = { 1} ou S = { 1} {2 } { 2 }