Divide all terms by 3 and so x2+18x+81= (x+9)(x+9) when factored
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6x + 54x -9 = 60x - 9
(3x - 1)(3x + 19)
18t + 4x -47t + 50x = -29t + 54x
The "answer" is a pair of numbers that, if you put one of them in place of 'x' and the other one in place of 'y', then the statement "-3y = -54x + 18" is true. There are an infinite number of different correct "answers".
It's not something that can have a SOLUTION unless it EQUALS something. x + 53x = 54x. Does 54x = 1? Then x = 1/54. Does 54x = 108? Then x = 2. etc.