1/2b-1/2-2/5b=-9/20

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Solution for 1/2b-1/2-2/5b=-9/20 equation: 


b in (-oo:+oo)

(1/2)*b-((2/5)*b)-(1/2) = -9/20 // + -9/20

(1/2)*b-((2/5)*b)-(1/2)-(-9/20) = 0

(1/2)*b+(-2/5)*b-1/2+9/20 = 0

1/10*b-1/20 = 0 // + 1/20

1/10*b = 1/20 // : 1/10

b = 1/20/1/10

b = 1/2

b = 1/2

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