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a/7+a/5=12
We simplify the equation to the form, which is simple to understand
a/7+a/5=12
We move all terms containing a to the left and all other terms to the right.
+ 0.14285714285714a + 0.2a=+12
We simplify left and right side of the equation.
+ 0.34285714285714a=+12
We divide both sides of the equation by 0.34285714285714 to get a.
a=35
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