$2-6x+10+8x=2\left( -5x-7 \right)+2x-4$
Distribute $2$ through the parentheses$2-6x+10+8x=-10x-14+2x-4$
Add the numbers$12-6x+8x=-10x-14+2x-4$
Collect like terms$12+2x=-10x-14+2x-4$
Collect like terms$12+2x=-8x-14-4$
Calculate the difference$12+2x=-8x-18$
Move the variable to the left-hand side and change its sign$12+2x+8x=-18$
Move the constant to the right-hand side and change its sign$2x+8x=-18-12$
Collect like terms$10x=-18-12$
Calculate the difference$10x=-30$
Divide both sides of the equation by $10$$x=-3$