Solve for x
x=260
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30x-20x-800=1800
Use the distributive property to multiply -20 by x+40.
10x-800=1800
Combine 30x and -20x to get 10x.
10x=1800+800
Add 800 to both sides.
10x=2600
Add 1800 and 800 to get 2600.
x=\frac{2600}{10}
Divide both sides by 10.
x=260
Divide 2600 by 10 to get 260.
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