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4a+6a+30+4a+20+3a-30=180
We simplify the equation to the form, which is simple to understand
4a+6a+30+4a+20+3a-30=180
We move all terms containing a to the left and all other terms to the right.
+4a+6a+4a+3a=+180-30-20+30
We simplify left and right side of the equation.
+17a=+160
We divide both sides of the equation by 17 to get a.
a=9.41176470588
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