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x in (-oo:+oo)
(4/7)*x-8 = -3 // + 3
(4/7)*x-8+3 = 0
4/7*x-5 = 0 // + 5
4/7*x = 5 // : 4/7
x = 5/4/7
x = 35/4
x = 35/4
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