1/2(100-x)=40

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Solution for 1/2(100-x)=40 equation: 


x in (-oo:+oo)

(1/2)*(100-x) = 40 // - 40

(1/2)*(100-x)-40 = 0

1/2*(100-x)-40 = 0

1/2*(100-x)-40 = 0

10-1/2*x = 0

10-1/2*x = 0

10-1/2*x = 0 // - 10

-1/2*x = -10 // : -1/2

x = -10/(-1/2)

x = 20

x = 20

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