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(3/5)*x-8 = (2/7)*(x-4) // - (2/7)*(x-4)
(3/5)*x-((2/7)*(x-4))-8 = 0
(-2/7)*(x-4)+(3/5)*x-8 = 0
(3*x)/5-2/7*(x-4)-8 = 0
(-2/7*5*(x-4))/5+(3*x)/5+(-8*5)/5 = 0
3*x-2/7*5*(x-4)-8*5 = 0
11/7*x-40+40/7 = 0
11/7*x-240/7 = 0
(11/7*x-240/7)/5 = 0
(11/7*x-240/7)/5 = 0 // * 5
11/7*x-240/7 = 0
11/7*x-240/7 = 0 // + 240/7
11/7*x = 240/7 // : 11/7
x = 240/7/11/7
x = 240/11
x = 240/11
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