Solve for x
x=-5
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20\left(-x+40\right)=900-0
Variable x cannot be equal to 40 since division by zero is not defined. Multiply both sides of the equation by -x+40.
-20x+800=900-0
Use the distributive property to multiply 20 by -x+40.
-20x+800=900
Subtract 0 from 900 to get 900.
-20x=900-800
Subtract 800 from both sides.
-20x=100
Subtract 800 from 900 to get 100.
x=\frac{100}{-20}
Divide both sides by -20.
x=-5
Divide 100 by -20 to get -5.
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