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(7*7)+4(7*5/2)=a
We move all terms to the left:
(7*7)+4(7*5/2)-(a)=0
We add all the numbers together, and all the variables
-a+49+4(+7*5/2)=0
We add all the numbers together, and all the variables
-1a+51=0
We move all terms containing a to the left, all other terms to the right
-a=-51
a=-51/-1
a=+51
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