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If 8x + 2 = 21, then 8x = 19.
If 3x = 24, then x = 8.
If 3x - 15 = 24, then 3x = 39.
If x = 9, then 9 = x.
Z= Z.
If x/2 = 5, then x = 10.
If 2(x - 3) = 5, then 2x - 6 = 5.
If 3x - y = 13 and x = 7, then 3(7) - y = 13.
If a = x and x = 5, then a = 5.