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x in (-oo:+oo)
(6/7)*x+1/4 = (1/4)*x-(5/14) // - (1/4)*x-(5/14)
(6/7)*x-((1/4)*x)+1/4+5/14 = 0
(6/7)*x+(-1/4)*x+1/4+5/14 = 0
17/28*x+17/28 = 0 // - 17/28
17/28*x = -17/28 // : 17/28
x = -17/28/17/28
x = -1
x = -1
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