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x in (-oo:+oo)
x-(2*x)+3/7-(5/3) = 3*x-(5/5)-25 // - 3*x-(5/5)-25
x-(2*x)-(3*x)+3/7-(5/3)+5/5+25 = 0
x-2*x-3*x+3/7-5/3+5/5+25 = 0
520/21-4*x = 0 // - 520/21
-4*x = -520/21 // : -4
x = -520/21/(-4)
x = 130/21
x = 130/21
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