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800a-ab_{0}+\left(8a-a\right)\left(1200-280\right)=3000
Use the distributive property to multiply a by 800-b_{0}.
800a-ab_{0}+7a\left(1200-280\right)=3000
Combine 8a and -a to get 7a.
800a-ab_{0}+7a\times 920=3000
Subtract 280 from 1200 to get 920.
800a-ab_{0}+6440a=3000
Multiply 7 and 920 to get 6440.
7240a-ab_{0}=3000
Combine 800a and 6440a to get 7240a.
\left(7240-b_{0}\right)a=3000
Combine all terms containing a.
\frac{\left(7240-b_{0}\right)a}{7240-b_{0}}=\frac{3000}{7240-b_{0}}
Divide both sides by 7240-b_{0}.
a=\frac{3000}{7240-b_{0}}
Dividing by 7240-b_{0} undoes the multiplication by 7240-b_{0}.
800a-ab_{0}+\left(8a-a\right)\left(1200-280\right)=3000
Use the distributive property to multiply a by 800-b_{0}.
800a-ab_{0}+7a\left(1200-280\right)=3000
Combine 8a and -a to get 7a.
800a-ab_{0}+7a\times 920=3000
Subtract 280 from 1200 to get 920.
800a-ab_{0}+6440a=3000
Multiply 7 and 920 to get 6440.
7240a-ab_{0}=3000
Combine 800a and 6440a to get 7240a.
-ab_{0}=3000-7240a
Subtract 7240a from both sides.
\left(-a\right)b_{0}=3000-7240a
The equation is in standard form.
\frac{\left(-a\right)b_{0}}{-a}=\frac{3000-7240a}{-a}
Divide both sides by -a.
b_{0}=\frac{3000-7240a}{-a}
Dividing by -a undoes the multiplication by -a.
b_{0}=7240-\frac{3000}{a}
Divide 3000-7240a by -a.