5x + 2 + 6x - 10 + x + 20 = 180
simplify
5x + 6x + x + 2 + 20 - 10 = 180
12x + 12 = 180
subtract 12 from both sides
12x + 12 (-12) = 180 (-12)
12x = 168
divide 12 from both sides (to isolate the x)
12x/12 = 168/12
x = 168/12
x = 14
x = 14 is your answer
hope this helps