exam Maths Puzzle Numerical Ability

i forgot what to do if the equation is not equal to zero. a fast response would be aprreciated

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exam Other Question

Simplify

(-6x^2y^4z^9)^2
(------------)
( 3x^6y^4z^3)
solve and show the equation used for the solution.

The length of a rectangle is 2 in. more than twice its width. If the perimeter of the rectangle is 34 in., find the dimensions of the rectangle.