Solve for x
x=15
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280x+60\left(145-5x\right)=8400
Multiply both sides of the equation by 7.
280x+8700-300x=8400
Use the distributive property to multiply 60 by 145-5x.
-20x+8700=8400
Combine 280x and -300x to get -20x.
-20x=8400-8700
Subtract 8700 from both sides.
-20x=-300
Subtract 8700 from 8400 to get -300.
x=\frac{-300}{-20}
Divide both sides by -20.
x=15
Divide -300 by -20 to get 15.
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