Solve for x
x=300
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3x+x+2x+400=2200
Combine x and 2x to get 3x.
4x+2x+400=2200
Combine 3x and x to get 4x.
6x+400=2200
Combine 4x and 2x to get 6x.
6x=2200-400
Subtract 400 from both sides.
6x=1800
Subtract 400 from 2200 to get 1800.
x=\frac{1800}{6}
Divide both sides by 6.
x=300
Divide 1800 by 6 to get 300.
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