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x in (-oo:+oo)
(-4/7)*x+3 = -1 // + 1
(-4/7)*x+1+3 = 0
4-4/7*x = 0 // - 4
-4/7*x = -4 // : -4/7
x = -4/(-4/7)
x = 7
x = 7
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