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(-5/6)*x-3 = (4/7)*x-122/21 // - (4/7)*x-122/21
(-5/6)*x-((4/7)*x)-(-122/21)-3 = 0
(-5/6)*x+(-4/7)*x+122/21-3 = 0
59/21-59/42*x = 0 // - 59/21
-59/42*x = -59/21 // : -59/42
x = -59/21/(-59/42)
x = 2
x = 2
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