Срочно помогите решить 2 примера, заранее огромное спасибо! Упростите выражение:1) (3)/(x+3)-(2)/(3-x)-(12)/(x^2-9);

1) ( 3 ) / ( x + 3 ) - ( 2 ) / ( 3 - x ) - ( 12 ) / ( x ^ 2 - 9 ) = ( 3 ) / ( x + 3 ) - ( 2 ) / ( - ( x - 3 ) ) - ( 12 ) / ( x ^ 2 - 9 ) = ( 3 ) / ( x + 3 ) + ( 2 ) / ( x - 3 ) - ( 12 ) / ( x ^ 2 - 9 ) = ( 3 ) / ( x + 3 ) + ( 2 ) / ( x - 3 ) - ( 12 ) / ( x ^ 2 - 3 ^ 2) = ( 3 ) / ( x + 3 ) + ( 2 ) / ( x - 3 ) - ( 12 ) / ( ( x - 3 ) * ( x + 3 ) ) = (3 * ( x - 3 ) + 2 * ( x + 3 ) - 12 ) / ( ( x - 3 ) * ( x + 3 ) ) = (3 * x - 9 + 2 * x + 6 - 12 ) / ( ( x - 3 ) * ( x + 3 ) ) = (5 * x - 15 ) / ( ( x - 3 ) * ( x + 3 ) ) = 5 * ( x - 3 ) / ( ( x + 3 ) * ( x - 3 ) ) = 5 / ( x + 3 ); 2)(2)/(25-10a+a^2)-(10)/(a^2-25) = (2)/ ( 5 - a ) ^ 2 -(10)/(a^2-25) = (2)/ ( 5 - a ) ^ 2 + (10)/(25 - a ^ 2 ) = (2)/ ( 5 - a ) ^ 2 + (10)/(( 5 - a ) * ( 5 + a ) ) = ( 2 * ( 5 + a ) + 10 * ( 5 - a ) ) / ( ( 5 - a ) ^ 2 * ( 5 + a ) ) = ( 10 + 2 * a + 50 - 10 * a ) ) / ( ( 5 - a ) ^ 2 * ( 5 + a ) ) = ( 60 - 8 *a ) ) / ( ( 5 - a ) ^ 2 * ( 5 + a ) ) = ( 60 - 8 *a ) ) / ( ( 5 - a ) ^ 2 * ( 5 + a ) ).