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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-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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