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x in (-oo:+oo)
(3/4)*x-(6/7) = x+25/28 // - x+25/28
(3/4)*x-x-(6/7)-(25/28) = 0
(3/4)*x-x-6/7-25/28 = 0
-1/4*x-7/4 = 0 // + 7/4
-1/4*x = 7/4 // : -1/4
x = 7/4/(-1/4)
x = -7
x = -7
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