7 minus x cannot be solved with more information, because x is an unknown variable.
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X - 7 = 11 X = 11+7 therefore X = 18 18 minus 7 equals 11.
There is a formula for "the difference of squares." (x + 7)(x - 7) = 0 x = 7, -7
If you mean: 5x/7 -6 = x then x = -21
(7 x 10) - 4 = 66
x/2 - 7 = -10 x/2 = -3 x = -3 x 2 x = -6