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(x+4)/7+(x+5)/2 = 4 // - 4
(x+4)/7+(x+5)/2-4 = 0
(2*(x+4))/(2*7)+(7*(x+5))/(2*7)+(-4*2*7)/(2*7) = 0
2*(x+4)+7*(x+5)-4*2*7 = 0
9*x-56+43 = 0
9*x-13 = 0
(9*x-13)/(2*7) = 0
(9*x-13)/(2*7) = 0 // * 2*7
9*x-13 = 0
9*x-13 = 0 // + 13
9*x = 13 // : 9
x = 13/9
x = 13/9
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