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1099=(5*100+15a+1000)-(6*100+8.5a+1000)
We simplify the equation to the form, which is simple to understand
1099=(5*100+15a+1000)-(6*100+8.5a+1000)
Remove unnecessary parentheses
1099=+1500+15a-(+1600+8.5a)
Remove unnecessary parentheses
1099=+1500+15a-1600-8.5a
We move all terms containing a to the left and all other terms to the right.
-15a+8.5a=+1500-1600-1099
We simplify left and right side of the equation.
-6.5a=-1199
We divide both sides of the equation by -6.5 to get a.
a=184.46153846154
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