Solve for x
x=120
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3x+690-5x=450
Use the distributive property to multiply 5 by 138-x.
-2x+690=450
Combine 3x and -5x to get -2x.
-2x=450-690
Subtract 690 from both sides.
-2x=-240
Subtract 690 from 450 to get -240.
x=\frac{-240}{-2}
Divide both sides by -2.
x=120
Divide -240 by -2 to get 120.
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