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(3*x-9)/12-((8-(5*x))/7) = 7*x-(3/5) // - 7*x-(3/5)
(3*x-9)/12-((8-(5*x))/7)-(7*x)+3/5 = 0
(3*x-9)/12-((8-5*x)/7)-7*x+3/5 = 0
(3*x-9)/12+(-1*(8-5*x))/7-7*x+3/5 = 0
(5*7*(3*x-9))/(5*7*12)+(-1*5*12*(8-5*x))/(5*7*12)+(-7*5*7*12*x)/(5*7*12)+(3*7*12)/(5*7*12) = 0
5*7*(3*x-9)-1*5*12*(8-5*x)-7*5*7*12*x+3*7*12 = 0
405*x-2940*x-795+252 = 0
252-2535*x-795 = 0
-2535*x-543 = 0
(-2535*x-543)/(5*7*12) = 0
(-2535*x-543)/(5*7*12) = 0 // * 5*7*12
-2535*x-543 = 0
-2535*x-543 = 0 // + 543
-2535*x = 543 // : -2535
x = 543/(-2535)
x = -181/845
x = -181/845
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