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(1/2)*x-3/7 = (3/7)*x-(3/14) // - (3/7)*x-(3/14)
(1/2)*x-((3/7)*x)-3/7+3/14 = 0
(1/2)*x+(-3/7)*x-3/7+3/14 = 0
1/14*x-3/14 = 0 // + 3/14
1/14*x = 3/14 // : 1/14
x = 3/14/1/14
x = 3
x = 3
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