Solve for a
a=181.708
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97-\left(-84.708\right)=a
Multiply 3 and -28.236 to get -84.708.
97+84.708=a
The opposite of -84.708 is 84.708.
181.708=a
Add 97 and 84.708 to get 181.708.
a=181.708
Swap sides so that all variable terms are on the left hand side.
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Matrix
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