Ans plzzz..................
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refer to the image for explanation
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Step-by-step explanation:
5x
7x
after 4 years
5x+4
7x+4
now
5x+4+7x+4=56
12x+8=56
12x=56-8
12x=48
x=48/72
x=4
5x=5*4=20
7x=7*4=28
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