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(1/7)*x-4 = (1/2)*x-(209/56) // - (1/2)*x-(209/56)
(1/7)*x-((1/2)*x)+209/56-4 = 0
(1/7)*x+(-1/2)*x+209/56-4 = 0
-5/14*x-15/56 = 0 // + 15/56
-5/14*x = 15/56 // : -5/14
x = 15/56/(-5/14)
x = -3/4
x = -3/4
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