2x^2-2x^2+5x-4x+2=5
x+2=5
x+2-5=0
x-3=0
x=3
Ответ: 3
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2x^2-2x^2+5x-4x+2=5
x+2=5
x+2-5=0
x-3=0
x=3
Ответ: 3