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x in (-oo:+oo)
x/70 = 5/7 // - 5/7
x/70-(5/7) = 0
x/70-5/7 = 0
1/70*x-5/7 = 0 // + 5/7
1/70*x = 5/7 // : 1/70
x = 5/7/1/70
x = 50
x = 50
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