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6/15=a/21
We simplify the equation to the form, which is simple to understand
6/15=a/21
Simplifying:
+ 0.4=a/21
Simplifying:
+ 0.4=0.047619047619a
We move all terms containing a to the left and all other terms to the right.
-0.047619047619a=-0.4
We simplify left and right side of the equation.
-0.047619047619a=-0.4
We divide both sides of the equation by -00.047619047619 to get a.
a=8.40000000001
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