Since you have A on both sides of the equation, 2A = 24A, A must be 0, though it is more likely that you're missing a term from one side of the equation.
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x=2ab+7 x= 2(3)(5) +7 x=30+7 x=37
3 x 3 + 4 x 8 = 9 + 32 ...
x equals 8
As your question implies, the quadratic formula. You know your a,b and c already. X = - b (+/-) sqrt(b2- 4ac)/2a X = - 10 (+/-) sqrt[102 - 4(3)(8)]/2(3) X = - 10 (+/-) sqrt(100 - 96)/6 X = - 10 (+/-) sqrt(4)/6 X = [- 10 (+/-) 2]/6 --------------------------- X = - 4/3 and X = - 2
-8 + x = -3 x = -3 + 8 x = 5