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x in (-oo:+oo)
21/7 = 4*x-4*2*x // - 4*x-4*2*x
21/7-(4*x)-(-4*2*x) = 0
8*x-4*x+21/7 = 0
4*x+3 = 0 // - 3
4*x = -3 // : 4
x = -3/4
x = -3/4
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