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(2*x-3)/3-((x-5)/7) = 3*x-((2*x-9)/21) // - 3*x-((2*x-9)/21)
(2*x-3)/3-((x-5)/7)+(2*x-9)/21-(3*x) = 0
(2*x-3)/3-((x-5)/7)+(2*x-9)/21-3*x = 0
(2*x-3)/3+(-1*(x-5))/7+(2*x-9)/21-3*x = 0
(7*21*(2*x-3))/(3*7*21)+(-1*3*21*(x-5))/(3*7*21)+(3*7*(2*x-9))/(3*7*21)+(-3*3*7*21*x)/(3*7*21) = 0
7*21*(2*x-3)-1*3*21*(x-5)+3*7*(2*x-9)-3*3*7*21*x = 0
231*x+42*x-1323*x-189-126 = 0
273*x-1323*x-315 = 0
-1050*x-315 = 0
(-1050*x-315)/(3*7*21) = 0
(-1050*x-315)/(3*7*21) = 0 // * 3*7*21
-1050*x-315 = 0
-1050*x-315 = 0 // + 315
-1050*x = 315 // : -1050
x = 315/(-1050)
x = -3/10
x = -3/10
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