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(1/2)*x-((4/7)*x)+10 = 557/56 // - 557/56
(1/2)*x-((4/7)*x)-(557/56)+10 = 0
(1/2)*x+(-4/7)*x-557/56+10 = 0
3/56-1/14*x = 0 // - 3/56
-1/14*x = -3/56 // : -1/14
x = -3/56/(-1/14)
x = 3/4
x = 3/4
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