90-x=1/2(x)

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Solution for 90-x=1/2(x) equation: 


x in (-oo:+oo)

90-x = (1/2)*x // - (1/2)*x

90-x-((1/2)*x) = 0

(-1/2)*x-x+90 = 0

90-3/2*x = 0 // - 90

-3/2*x = -90 // : -3/2

x = -90/(-3/2)

x = 60

x = 60

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