12-x²=3-x(x-4)
12-х^2=3-x^2+4x
12=3+4x
-4x=3-12
-4x=-9
x=9/4
x=2.25
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12-x²=3-x(x-4)
12-х^2=3-x^2+4x
12=3+4x
-4x=3-12
-4x=-9
x=9/4
x=2.25