3x+15+5x=-1 (answer)

Danielle, It is simple: Keep all the unknowns (x 's) on the Left Hand Side (LHS) and move all the known to the Right Hand Side (RHS), so we have: 8x = -16 or x = -2. now check your answer, by substituting the value of x in the first equation: 3x +15+5x = -1 So, LHS...