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Question

Solve 10x2+15x+635x2−25x+12=2x+3x−5

A
9
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B
5
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C
8
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D
0
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Solution

The correct option is B 9
10x2+15x+635x225x+12=2x+3x5
=>5x(2x+3)+635x(x5)+12=2x+3x5
Let, 2x+3=a and x5=b
=>5xa+635xb+12=ab
=>5xab+63b=5xab+12a
=>63(x5)=12(2x+3)
=>63x315=24x+36
=>39x=280
=>x=9

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