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3a+1+90+35=180
We simplify the equation to the form, which is simple to understand
3a+1+90+35=180
We move all terms containing a to the left and all other terms to the right.
+3a=+180-1-90-35
We simplify left and right side of the equation.
+3a=+54
We divide both sides of the equation by 3 to get a.
a=18
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