If this is algebra then;
3x plus 12x = 15x
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12x + 131 = 189 + 3x 12x - 3x + 131 - 189 = 0 9x - 58 = 0 9x = 58 x = 6,44444
3x+12x = 15 15x = 15 x = 1
x works out as 5/3
(3x + 5)(3x^2 + 4)
(12x2 + 18) / (3x2 + 6) = (4x2 + 6) / (x2 + 2)