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(2*x-13)/28 = -4/7 // + -4/7
(2*x-13)/28-(-4/7) = 0
(2*x-13)/28+4/7 = 0
(7*(2*x-13))/(7*28)+(4*28)/(7*28) = 0
7*(2*x-13)+4*28 = 0
14*x+21 = 0
(14*x+21)/(7*28) = 0
(14*x+21)/(7*28) = 0 // * 7*28
14*x+21 = 0
14*x+21 = 0 // - 21
14*x = -21 // : 14
x = -21/14
x = -3/2
x = -3/2
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