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