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(6/7)*x+5 = 4*x+89/42 // - 4*x+89/42
(6/7)*x-(4*x)-(89/42)+5 = 0
(6/7)*x-4*x-89/42+5 = 0
121/42-22/7*x = 0 // - 121/42
-22/7*x = -121/42 // : -22/7
x = -121/42/(-22/7)
x = 11/12
x = 11/12
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