Express the following rational numbers in the standard form-12/21 -35/-70
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[ -12 /21 ] - [ -35/-70 ]
= [ -12 /21 ] - [ 35/70 ] {-ve / -ve = +ve }
lcm of 21 and 70 = 1470
= [ -12/21 x 70/70 ] - [ 35/70 x 21/21 ]
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