Q3. Find 4x x 5y and multiply it by 7z.
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first week wants to multiply the 4x x 7z
=4x7=28, x x z=xz
=28xz
next we are multiply the 5y x 7z
=5x7 =35, y x z =yz
=35yz
so the answer is 28xz35yz
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