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Q.

If  5x+6(2+x)(x1)=113(x1)+y, then y=

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a

43(2+x)

b

43(2+x)

c

23(2+x)

d

32(2+x)

answer is B.

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Detailed Solution

5x+6(2+x)(x1)=113(x1)+y

5x+6(2+x)(x1)=A(2+x)+B(x1)

5x+6(2+x)(x1)=A(x1)+B(2+x)(2+x)(x1)

5x+6=AxA+2B+Bx

A+B=5(1)

A+2B=6(2)

(1)+(2)

A+B=5

A+2B=6

3B=11

B=113

A+B=5

A+113=5

A=5113=15113=43

5x+6(2+x)(x1)=43(2+x)+113(x1)

y=43(2+x)

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