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(2/7)*x+7 = (-6/7)*x+303/49 // - (-6/7)*x+303/49
(2/7)*x-((-6/7)*x)-(303/49)+7 = 0
(2/7)*x+(6/7)*x-303/49+7 = 0
8/7*x+40/49 = 0 // - 40/49
8/7*x = -40/49 // : 8/7
x = -40/49/8/7
x = -5/7
x = -5/7
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