Solve for a
a=4
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192=a\left(12+16+20\right)
Multiply 16 and 12 to get 192.
192=a\left(28+20\right)
Add 12 and 16 to get 28.
192=a\times 48
Add 28 and 20 to get 48.
a\times 48=192
Swap sides so that all variable terms are on the left hand side.
a=\frac{192}{48}
Divide both sides by 48.
a=4
Divide 192 by 48 to get 4.
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