{(1/3)^-1 -(1/4)^-1}^-1 solve step by step rule
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Brother answer is one
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[ (1/3)‐¹ — (1/4)‐1 ] -¹
[ (3) ¹ — (4) ¹ ] -¹
[ (3 — 4) ] ‐¹
[ (‐1) ] -¹
-1^-1
= -1
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