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(6/7)*x+5 = 2*x+31/7 // - 2*x+31/7
(6/7)*x-(2*x)-(31/7)+5 = 0
(6/7)*x-2*x-31/7+5 = 0
4/7-8/7*x = 0 // - 4/7
-8/7*x = -4/7 // : -8/7
x = -4/7/(-8/7)
x = 1/2
x = 1/2
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