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(6*x+7)/5 = (5*x+1)/4+1 // - (5*x+1)/4+1
(6*x+7)/5-((5*x+1)/4)-1 = 0
(6*x+7)/5+(-1*(5*x+1))/4-1 = 0
(4*(6*x+7))/(4*5)+(-1*5*(5*x+1))/(4*5)+(-1*4*5)/(4*5) = 0
4*(6*x+7)-1*5*(5*x+1)-1*4*5 = 0
23-x-20 = 0
3-x = 0
(3-x)/(4*5) = 0
(3-x)/(4*5) = 0 // * 4*5
3-x = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
x = 3
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