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(x+4)/7 = 1-((x+3)/5) // - 1-((x+3)/5)
(x+4)/7+(x+3)/5-1 = 0
(5*(x+4))/(5*7)+(7*(x+3))/(5*7)+(-1*5*7)/(5*7) = 0
5*(x+4)+7*(x+3)-1*5*7 = 0
12*x-35+41 = 0
12*x+6 = 0
(12*x+6)/(5*7) = 0
(12*x+6)/(5*7) = 0 // * 5*7
12*x+6 = 0
12*x+6 = 0 // - 6
12*x = -6 // : 12
x = -6/12
x = -1/2
x = -1/2
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