Respuesta :
1. Collect like terms. When a term changes position from the equal sign it will also change its sign.( positive becomes negative, negative becomes positive)
3x - 4x = 5 + 2
-x = 7 divide both side by -1
x = -7
3x - 4x = 5 + 2
-x = 7 divide both side by -1
x = -7