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10=0.2\left(-x+100\right)
Variable x cannot be equal to 100 since division by zero is not defined. Multiply both sides of the equation by -x+100.
10=-0.2x+20
Use the distributive property to multiply 0.2 by -x+100.
-0.2x+20=10
Swap sides so that all variable terms are on the left hand side.
-0.2x=10-20
Subtract 20 from both sides.
-0.2x=-10
Subtract 20 from 10 to get -10.
x=\frac{-10}{-0.2}
Divide both sides by -0.2.
x=\frac{-100}{-2}
Expand \frac{-10}{-0.2} by multiplying both numerator and the denominator by 10.
x=50
Divide -100 by -2 to get 50.