1) x^2 - (x^2 - 10x + 25) = 10; x^2 - x^2 +10x - 25 = 10
10x - 25 =10; 10x = 35; x=3,5
2) x^2 + x - 3x - 3 = x^2 - 4x + 4; x - 3x + 4x = 4+3
2x = 7; x = 3,5
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1) x^2 - (x^2 - 10x + 25) = 10; x^2 - x^2 +10x - 25 = 10
10x - 25 =10; 10x = 35; x=3,5
2) x^2 + x - 3x - 3 = x^2 - 4x + 4; x - 3x + 4x = 4+3
2x = 7; x = 3,5