45+31-(x-16)+58-7=28
45 + 31 – x + 16 + 58 – 7 = 28
– x = 28 + 7 – 58 – 16 – 31 – 45
-x = -115
x = 115
45+31-(x-16)+58-7=28
45 + 31 – x + 16 + 58 – 7 = 28
– x = 28 + 7 – 58 – 16 – 31 – 45
-x = -115
x = 115