-[10x-(3x+4)] = -5-[4(3x-3)-3x]
-[10x-3x-4] = -5-[12x-12-3x]
-[7x-4] = -5 - [9x-12]
-7x + 4 = -5 - 9x + 12
-7x + 4 = -9x + 7
add 9x to both sides
2x + 4 = 7
subtract 4 from both sides
2x = 3
divide both sides by 2, then x = 3/2 since it has a solution, it is conditional