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x in (-oo:+oo)
x+(2/3)*x+(1/2)*x+(1/7)*x = 97 // - 97
x+(2/3)*x+(1/2)*x+(1/7)*x-97 = 0
97/42*x-97 = 0 // + 97
97/42*x = 97 // : 97/42
x = 97/97/42
x = 42
x = 42
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