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(6/7)*x-3 = (2/3)*x-5/7 // - (2/3)*x-5/7
(6/7)*x-((2/3)*x)-(-5/7)-3 = 0
(6/7)*x+(-2/3)*x+5/7-3 = 0
4/21*x-16/7 = 0 // + 16/7
4/21*x = 16/7 // : 4/21
x = 16/7/4/21
x = 12
x = 12
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