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a in (-oo:+oo)
4*a+1 = (-4/7)*a+1 // - (-4/7)*a+1
4*a-((-4/7)*a)-1+1 = 0
4*a+(4/7)*a-1+1 = 0
32/7*a = 0 // : 32/7
a = 0
a = 0
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