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x in (-oo:+oo)
x/70 = 6/21 // - 6/21
x/70-(6/21) = 0
x/70-2/7 = 0
1/70*x-2/7 = 0 // + 2/7
1/70*x = 2/7 // : 1/70
x = 2/7/1/70
x = 20
x = 20
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