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a/2-20=30
We simplify the equation to the form, which is simple to understand
a/2-20=30
We move all terms containing a to the left and all other terms to the right.
+ 0.5a=+30+20
We simplify left and right side of the equation.
+ 0.5a=+50
We divide both sides of the equation by 0.5 to get a.
a=100
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