Add 7 to both sides
-93 = 150 + 2x + 7x
Simplify 150 + 2x + 7x to 150 + 9x
-93 = 150 + 9x
Subtract 150 from both sides
-93 - 150 = 9x
Simplify -93 - 150 to -243
-243 = 9x
Divide both sides by 9
-243/9 = x
Simplify 243/9 to 27
-27 = x
Switch sides
x = -27