18 x 17 +(-3)] = [18 x 7] + [18 X (-3)]
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a 18 x [7 + –3] = [18 x 7] + [18 x –3] ⇒ 18 x 4 = 126 + –54 ⇒ 72 = 72 ⇒ L.H.S. = R.H.S. Hence verified.b–21 x [–4 + –6] = [–21 x –4] + [–21 x –6] ⇒ –21 x –10 = 84 + 126 ⇒ 210 = 210 ⇒ L.H.S. = R.H.S.
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