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(x+7)/10 = (x-5)/4+6/5 // - (x-5)/4+6/5
(x+7)/10-((x-5)/4)-(6/5) = 0
(x+7)/10-((x-5)/4)-6/5 = 0
(x+7)/10+(-1*(x-5))/4-6/5 = 0
(4*5*(x+7))/(4*5*10)+(-1*5*10*(x-5))/(4*5*10)+(-6*4*10)/(4*5*10) = 0
4*5*(x+7)-1*5*10*(x-5)-6*4*10 = 0
390-30*x-240 = 0
150-30*x = 0
(150-30*x)/(4*5*10) = 0
(150-30*x)/(4*5*10) = 0 // * 4*5*10
150-30*x = 0
150-30*x = 0 // - 150
-30*x = -150 // : -30
x = -150/(-30)
x = 5
x = 5
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