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(2/3)*x-((1/7)*x)+7 = 5/7 // - 5/7
(2/3)*x-((1/7)*x)-(5/7)+7 = 0
(-1/7)*x+(2/3)*x-5/7+7 = 0
11/21*x+44/7 = 0 // - 44/7
11/21*x = -44/7 // : 11/21
x = -44/7/11/21
x = -12
x = -12
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