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x in (-oo:+oo)
(-4/7)*x+4 = x+279/56 // - x+279/56
(-4/7)*x-x-(279/56)+4 = 0
(-4/7)*x-x-279/56+4 = 0
-11/7*x-55/56 = 0 // + 55/56
-11/7*x = 55/56 // : -11/7
x = 55/56/(-11/7)
x = -5/8
x = -5/8
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