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x in (-oo:+oo)
x-35 = (2/7)*x // - (2/7)*x
x-((2/7)*x)-35 = 0
x+(-2/7)*x-35 = 0
5/7*x-35 = 0 // + 35
5/7*x = 35 // : 5/7
x = 35/5/7
x = 49
x = 49
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