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f in (-oo:+oo)
(4/5)*f-(5/6)+7 = 7/30 // - 7/30
(4/5)*f-(5/6)-(7/30)+7 = 0
(4/5)*f-5/6-7/30+7 = 0
4/5*f+89/15 = 0 // - 89/15
4/5*f = -89/15 // : 4/5
f = -89/15/4/5
f = -89/12
f = -89/12
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