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7-a/4.2=3.5
We simplify the equation to the form, which is simple to understand
7-a/4.2=3.5
Simplifying:
7-0.238095238095a=3.5
We move all terms containing a to the left and all other terms to the right.
-0.238095238095a=+3.5-7
We simplify left and right side of the equation.
-0.238095238095a=-3.5
We divide both sides of the equation by -0.238095238095 to get a.
a=14.7
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