(a-8)/12=(2a-5)/3

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Solution for (a-8)/12=(2a-5)/3 equation: 


a in (-oo:+oo)

(a-8)/12 = (2*a-5)/3 // - (2*a-5)/3

(a-8)/12-((2*a-5)/3) = 0

(a-8)/12+(-1*(2*a-5))/3 = 0

(3*(a-8))/(3*12)+(-1*12*(2*a-5))/(3*12) = 0

3*(a-8)-1*12*(2*a-5) = 0

36-21*a = 0

(36-21*a)/(3*12) = 0

(36-21*a)/(3*12) = 0 // * 3*12

36-21*a = 0

36-21*a = 0 // - 36

-21*a = -36 // : -21

a = -36/(-21)

a = 12/7

a = 12/7

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