Solve for x
x=140
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30x+40x-800=9000
Use the distributive property to multiply 20 by 2x-40.
70x-800=9000
Combine 30x and 40x to get 70x.
70x=9000+800
Add 800 to both sides.
70x=9800
Add 9000 and 800 to get 9800.
x=\frac{9800}{70}
Divide both sides by 70.
x=140
Divide 9800 by 70 to get 140.
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