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x in (-oo:+oo)
x-(2/5)+25 = -x/7 // + -x/7
x-(-x/7)-(2/5)+25 = 0
x+(1/7)*x-2/5+25 = 0
8/7*x+123/5 = 0 // - 123/5
8/7*x = -123/5 // : 8/7
x = -123/5/8/7
x = -861/40
x = -861/40
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