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