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20-a*10-10=170
We simplify the equation to the form, which is simple to understand
20-a*10-10=170
We move all terms containing a to the left and all other terms to the right.
-10a=+170-20+10
We simplify left and right side of the equation.
-10a=+160
We divide both sides of the equation by -10 to get a.
a=-16
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