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**In the arrangement shown in the figure, find the acceleration of M in upward direction. The pulleys are light. The strings are mass less and friction between the string and the pulleys is negligible.**

**The options are given. The final answer is (B) and this was the solution:**

I don't understand the 1+7x2 step right there.

Also I fail to understand why there is 49m in the denominator of the solution instead of 7m (I'm assuming the equation is multiplied by 7. I might be wrong though.)

Can anyone explain me the solutions please? Thanks.

P.S.: Sorry about the low quality images, it was in a kind of jiffy.

I don't understand the 1+7x2 step right there.

Also I fail to understand why there is 49m in the denominator of the solution instead of 7m (I'm assuming the equation is multiplied by 7. I might be wrong though.)

Can anyone explain me the solutions please? Thanks.

P.S.: Sorry about the low quality images, it was in a kind of jiffy.