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(5*x)/7+12/7 = -13/7 // + -13/7
(5*x)/7+12/7-(-13/7) = 0
(5*x)/7+12/7+13/7 = 0
5/7*x+25/7 = 0 // - 25/7
5/7*x = -25/7 // : 5/7
x = -25/7/5/7
x = -5
x = -5
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