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यदि f : R rarr R, f(x) = 2x + 7 द्वारा ...

यदि `f : R rarr R, f(x) = 2x + 7` द्वारा परिभाषित है। साबित करें कि f एकैकी आच्छादक है। f का प्रतिलोम भी निकालें ।

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