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x in (-oo:+oo)
3*x+4 = 51/5 // - 51/5
3*x-(51/5)+4 = 0
3*x-51/5+4 = 0
3*x-31/5 = 0 // + 31/5
3*x = 31/5 // : 3
x = 31/5/3
x = 31/15
x = 31/15
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