(90-x)/2=(168-x)/5

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Solution for (90-x)/2=(168-x)/5 equation: 


x in (-oo:+oo)

(90-x)/2 = (168-x)/5 // - (168-x)/5

(90-x)/2-((168-x)/5) = 0

(90-x)/2+(-1*(168-x))/5 = 0

(5*(90-x))/(2*5)+(-1*2*(168-x))/(2*5) = 0

5*(90-x)-1*2*(168-x) = 0

114-3*x = 0

(114-3*x)/(2*5) = 0

(114-3*x)/(2*5) = 0 // * 2*5

114-3*x = 0

114-3*x = 0 // - 114

-3*x = -114 // : -3

x = -114/(-3)

x = 38

x = 38

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