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x in (-oo:+oo)
(2/3)*x+(4/7)*x+7 = 925/147 // - 925/147
(2/3)*x+(4/7)*x-(925/147)+7 = 0
(2/3)*x+(4/7)*x-925/147+7 = 0
26/21*x+104/147 = 0 // - 104/147
26/21*x = -104/147 // : 26/21
x = -104/147/26/21
x = -4/7
x = -4/7
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