The additional factor for the second fraction is 2y.
The additional factor for the first fraction is 3x^1 * z.
The least common denominator is 12x^2 * y^2 * z^4.
The second fraction is (oy) / (6x^2 * z^4).
The first fraction is (7x) / (4y^2 * z^3).
The expression (a^2) / (4b) evaluates to 26.
The expression 11 / (6c^2 * d^7) is as it is.
The expression 7 / (3x^4 * y^2) is as it is.
The expression 1 / (4a) is as it is.
The expression 5 * 6(x + y) simplifies to 30(x + y).
The expression sigma / (3c^3 * d^5) is as it is.
The expression sigma / (4x^2 * y^3 * z) is as it is.
The expression z / (5(a - b)) is as it is.
The expression 9 * (x + y)^2 simplifies to 9(x^2 + 2xy + y^2).
