3 (x+1) = 12+4x (x-1)
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Answer:
3x+3=12+4x(x-1)
3x+3=12+4x²-4
transpose "-4" to l.h.s
3x+3+4=4x²+12
3x+7=4x²+12
transpose"7" to r.h.s
3x=4x²+5
transpose "3x" to r.h.s
4x²-3x+5=0
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