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x in (-oo:+oo)
(4/7)*x+1/4 = 3/28 // - 3/28
(4/7)*x+1/4-(3/28) = 0
(4/7)*x+1/4-3/28 = 0
4/7*x+1/7 = 0 // - 1/7
4/7*x = -1/7 // : 4/7
x = -1/7/4/7
x = -1/4
x = -1/4
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