x+10+3x+14=180
4x+24=180
4x=180-24
4x=156
x=156\4
x=39
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11 plus 5-10 plus 20-9 plus 14-10 is equal to 21
6+1 equals 7. Plus 3 equals 10. Plus 4 equals 14.
M= 2.
71
To find two-thirds of 21, you multiply 21 by 2/3, which equals 14. Then, adding 166 to 14 gives you 180. Therefore, 166 plus two-thirds of 21 equals 180.