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x in (-oo:+oo)
(3*x)/4-7 = -9 // + 9
(3*x)/4-7+9 = 0
3/4*x+2 = 0 // - 2
3/4*x = -2 // : 3/4
x = -2/3/4
x = -8/3
x = -8/3
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