a • (2x8 - 1) - b • (3x8 - 1) = c | ausmultiplizieren
2 * a * x^8 - a - ( 3 * b * x^8 - b ) = c
2 * a * x^8 - a - 3 * b * x^8 + b = c
2 * a * x^8 - 3 * b * x^8 = c - b + a
x^8 * ( 2 * a - 3 * b ) = c - b + a
x^8 = ( a - b + c ) / ( 2 * a - 3 * b )
x = 8√ ( ( a - b + c ) / ( 2 * a - 3 * b ) )
oder
x = ( a - b + c ) / ( 2 * a - 3 * b ) ^{1/8}