4(x+y)]/(5x^2y^3) ÷ (-2x-2y)/10
10 * 4 ( x + y ) / [ ( 5 x ^ 2 y ^ 3 ) * ( - 2 x - 2 y ) ] = 40 ( x + y ) / [ ( 5 x ^ 2 y ^ 3 ) * - 2 ( x + y ) ] = 40 / - 2 * 5 x ^ 2 y ^ 3 ) = 40 / - 10 ( x ^ 2 y ^ 3 ) = - 4 / x ^ 2 y ^ 3
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