Respuesta :

LagMaster
They are congruent (4x-4)=(3x+17)
x=21
How I got the answer
4x=3x+17+4
4x=3x+21
4x−3x=21x=21

Blaugrana
4x-4=3x+17
-4 -4
-4=-x+17
-17 -17
-21=-x

you can't have a negative x, so you make both sides positive which gives you x=21

Hope I helped. ☺