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5-(x/3) = (3*(x+1))/7 // - (3*(x+1))/7
5-((3*(x+1))/7)-(x/3) = 0
(-3/7)*(x+1)-(x/3)+5 = 0
5-3/7*(x+1)-x/3 = 0
(-3/7*3*(x+1))/3-x/3+(3*5)/3 = 0
3*5-3/7*3*(x+1)-x = 0
15-16/7*x-9/7 = 0
96/7-16/7*x = 0
(96/7-16/7*x)/3 = 0
(96/7-16/7*x)/3 = 0 // * 3
96/7-16/7*x = 0
96/7-16/7*x = 0 // - 96/7
-16/7*x = -96/7 // : -16/7
x = -96/7/(-16/7)
x = 6
x = 6
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