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(x+1)/3+(x+2)/7 = 5 // - 5
(x+1)/3+(x+2)/7-5 = 0
(7*(x+1))/(3*7)+(3*(x+2))/(3*7)+(-5*3*7)/(3*7) = 0
7*(x+1)+3*(x+2)-5*3*7 = 0
10*x-105+13 = 0
10*x-92 = 0
(10*x-92)/(3*7) = 0
(10*x-92)/(3*7) = 0 // * 3*7
10*x-92 = 0
10*x-92 = 0 // + 92
10*x = 92 // : 10
x = 92/10
x = 46/5
x = 46/5
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