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(2/7)*x-(4/5) = 6*x-(78/35) // - 6*x-(78/35)
(2/7)*x-(6*x)-(4/5)+78/35 = 0
(2/7)*x-6*x-4/5+78/35 = 0
10/7-40/7*x = 0 // - 10/7
-40/7*x = -10/7 // : -40/7
x = -10/7/(-40/7)
x = 1/4
x = 1/4
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