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(1/2)*x+(2/6)*x = (2/7)*x+1 // - (2/7)*x+1
(1/2)*x+(2/6)*x-((2/7)*x)-1 = 0
(1/2)*x+(2/6)*x+(-2/7)*x-1 = 0
23/42*x-1 = 0 // + 1
23/42*x = 1 // : 23/42
x = 1/23/42
x = 42/23
x = 42/23
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