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3x²+3x=5x+3
3x²+3x-5x-3=0
3x²-2x-3=0
Factorizamos: Como no se puede factorizar lo sacamos con formula
3x²-2x-3=0
Δ=-2²-4(3)(-3)
Δ=4+36
Δ=40
x₁,₂= 2⁺/₋ √40
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6
x₁,₂= 2 ⁺/₋ 2√10
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6
x₁,₂= 1⁺/₋ √10
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3
Rpta: x₁,₂= 1⁺/₋ √10
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3