18t + 4x -47t + 50x = -29t + 54x
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4x2+50x = 0 4x(x+12.5) = 0 x = 0 or x = -12.5
the answer to this is 4x + 57 (assuming that the 4x in the question is algebra)
4x^2 + 3
(4x + 3)(4x + 3) (4x + 3)2
4x + 16 + 1 = 4x + 17 which cannot be factorised.