(x-30)/7=(x-10)/3

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Solution for (x-30)/7=(x-10)/3 equation: 


x in (-oo:+oo)

(x-30)/7 = (x-10)/3 // - (x-10)/3

(x-30)/7-((x-10)/3) = 0

(x-30)/7+(-1*(x-10))/3 = 0

(3*(x-30))/(3*7)+(-1*7*(x-10))/(3*7) = 0

3*(x-30)-1*7*(x-10) = 0

-4*x-20 = 0

(-4*x-20)/(3*7) = 0

(-4*x-20)/(3*7) = 0 // * 3*7

-4*x-20 = 0

-4*x-20 = 0 // + 20

-4*x = 20 // : -4

x = 20/(-4)

x = -5

x = -5

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