Part A explanation-using distributive property 4 x 2x = 8x then 4x -5=-20 then put it together 8x-20
Part B explanation- from part A you have 8x-20 then you have to add on the rest of the equation so it looks like this 8x - 20+ 3x you combine the numbers with x’s 8x + 3x= 11x so then add it to the rest of the equation and you have 11x - 20
