simplify: [-3/5 × 13/3] + [ 2/9 × 13/4]
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= (-3/5 × 13 / 3 ) + ( 2/9 × 13/4)
= ( -39/15) + ( 26 / 36)
lcm of 15 and 36 is 180
= (- 39× 12 / 15 × 12 ) + ( 26×5 / 36 × 5)
= -468 / 180 + 130/ 180
= -338 / 180
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