(3-x)^2=(4-x)^2
9-6x+x^2=16-8x+x^2
-6x+x^2+8x-x^2=16-9
2x=7
x=3,5
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(3-x)^2=(4-x)^2
9-6x+x^2=16-8x+x^2
-6x+x^2+8x-x^2=16-9
2x=7
x=3,5