(56+x)-11=9
56 + x – 11 = 9
x = 9 + 11 – 56
x = -36
7 + 21 – 1x = 9
– x = 9 – 21 – 7
-x = -19
x = 19
x + 18 – 7 = 51
x = 51 + 7 – 18
x = 40
(56+x)-11=9
56 + x – 11 = 9
x = 9 + 11 – 56
x = -36
7 + 21 – 1x = 9
– x = 9 – 21 – 7
-x = -19
x = 19
x + 18 – 7 = 51
x = 51 + 7 – 18
x = 40