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4x + 12 + 5x + 10
9x + 22 Rpta
3) 6(x^2 + 4) - 3(x^2 + 1) + 5(x^2 + 2)
6x^2 + 24 - 3x^2 - 3 + 5x^2 + 10
8x^2 + 31 Rpta
4) x^2(y^2 + 1) + y2(x^2 + 1) - 3x^2 y^2
x^2 y^2 + x^2 + y^2 - 3x^2 y^2
-2x^2 y^2 + x^2 + y^2 Rpta
5) (a+5)(a-5) -3(a+2)(a-2) 5(a+4)
a^2 - 25 -3(a^2 - 4) 5a + 20
a^2 - 25 -3a^2 + 12(5a + 20)
-2a^2 - 25 + 60a + 240
-2a^2 + 60a + 215 Rpta