$8x-2x+1=3x-11$
Collect like terms$6x+1=3x-11$
Move the variable to the left-hand side and change its sign$6x+1-3x=-11$
Move the constant to the right-hand side and change its sign$6x-3x=-11-1$
Collect like terms$3x=-11-1$
Calculate the difference$3x=-12$
Divide both sides of the equation by $3$$x=-4$