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x/7+17/10 = (4*x)/5 // - (4*x)/5
x/7-((4*x)/5)+17/10 = 0
x/7+(-4/5)*x+17/10 = 0
17/10-23/35*x = 0 // - 17/10
-23/35*x = -17/10 // : -23/35
x = -17/10/(-23/35)
x = 119/46
x = 119/46
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