[7/20*6/17]+(-2/5)-[7/20*(-11/17)
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= [ 7/20 x 6/17 ]+ (-2/5) - [7/20 x (-11/17)
= (42/340) + (-2/5) - (-77/340)
= 42/340 - (-77/340) + (-2/5)
= -119/340 + -2/5
= -119/340 + -2/5 x 68
= -119/340 + (-136/340)
= -255/340
= -51/68
Hope it helps !
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