2(x-1)²+(x+3)²-3(x-3)(x+3)=46
2(x²-2x+1)+(x²+6x+9)-3(x²-9)=46
2x²-4x+2+x²+6x+9-3x²+27=46
2x²-4x+x²+6x-3x²=46-2-9-27
2x=8
x=8:2
x=4
Ответ:x=4
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2(x-1)²+(x+3)²-3(x-3)(x+3)=46
2(x²-2x+1)+(x²+6x+9)-3(x²-9)=46
2x²-4x+2+x²+6x+9-3x²+27=46
2x²-4x+x²+6x-3x²=46-2-9-27
2x=8
x=8:2
x=4
Ответ:x=4