We have
[tex]3x+7=11x+15[/tex]
We subtract 11x on both sides and 7 on both sides
[tex]3x-11x+7-7=11x-11x+15-7[/tex]
we sum like terms
[tex]\begin{gathered} 3x-11x=15-7 \\ -8x=8 \\ \end{gathered}[/tex]
Then we isolate the x
[tex]x=-\frac{8}{8}=-1[/tex]
ANSWER
x=-1
The equation only have one solution
