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(3*x)/7+2/7 = (4*x)/5-(1/5) // - (4*x)/5-(1/5)
(3*x)/7-((4*x)/5)+2/7+1/5 = 0
(3*x)/7+(-4/5)*x+2/7+1/5 = 0
17/35-13/35*x = 0 // - 17/35
-13/35*x = -17/35 // : -13/35
x = -17/35/(-13/35)
x = 17/13
x = 17/13
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