8 - 2x + 6x = 24
collect (add) terms of x
8 + 4x = 24
subtract 8 from both sides
4x = 16
divide both sides by 4
x = 4
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No
21 is the only solution of that equation.
(24*76)+(76*56) = 5600
Multiplying the first equation by -3 gives -21x - 6y = -48 but the other equation gives 24 as the value of the same expression, so you are correct, there is no solution
It equals 24.