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X in (-oo:+oo)
4*X+2*X-(4/7)-(1/5) = 7 // - 7
4*X+2*X-(4/7)-(1/5)-7 = 0
4*X+2*X-4/7-1/5-7 = 0
6*X-272/35 = 0 // + 272/35
6*X = 272/35 // : 6
X = 272/35/6
X = 136/105
X = 136/105
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