-3(x + 4) + 15 = 6 - 4x......distribute the -3 thru the parenthesis
-3x - 12 + 15 = 6 - 4x....simplify
-3x + 3 = 6 - 4x...add 4x to both sides
-3x + 4x + 3 = 6....subtract 3 from both sides
-3x + 4x = 6 - 3....simplify
x = 3 <==
You're going to want to solve the equations then mark them onto the lines. Number four would turn into -6 *Is greater than* 5n + 9 and number six would turn into -2p *is less than or equal to* -2.
There are many solutions, and that's an understatement. There are actually an infinite number of solutions.