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(1/7)*x-(9/10) = 3*x-(2493/770) // - 3*x-(2493/770)
(1/7)*x-(3*x)-(9/10)+2493/770 = 0
(1/7)*x-3*x-9/10+2493/770 = 0
180/77-20/7*x = 0 // - 180/77
-20/7*x = -180/77 // : -20/7
x = -180/77/(-20/7)
x = 9/11
x = 9/11
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