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5*(x+1/7-1)-x = 2/7-2*x // - 2/7-2*x
5*(x+1/7-1)-x-(-2*x)-(2/7) = 0
5*(x+1/7-1)-x+2*x-2/7 = 0
5*(x-6/7)-x+2*x-2/7 = 0
(5*7*(x-6/7))/7+(7*(-x))/7+(2*7*x)/7-2/7 = 0
5*7*(x-6/7)+7*(-x)+2*7*x-2 = 0
28*x+14*x-30-2 = 0
42*x-30-2 = 0
42*x-32 = 0
(42*x-32)/7 = 0
(42*x-32)/7 = 0 // * 7
42*x-32 = 0
42*x-32 = 0 // + 32
42*x = 32 // : 42
x = 32/42
x = 16/21
x = 16/21
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