add the following using sutable property as applicable b. -4/9 + -2/7 + -5/14 + 3/18
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-4/9+(-2/7)+(-5/14)+3/18
= -4/9-2/7-5/14+3/18
= 3/18-4/9-2/7-5/14
=(3-4×2)/18-(2×2-5)/14
= (3-8)/18-(4-5)/14
= -5/18-(-1)/14
= -5/18+1/14
=(-5×7+1×9)/126
=(-35+9)/126
= -26/126
= -13/63
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