Točno: 4x − x = 3x, 5x·2x = 10x2, 8x2 + 3x2=11x2, 8x + 5x = 13x, x·(5x + 2) = 5x2+2x, 3x·8 = 24x, x2 + 3x2 = 4x2, (x + 2)·(x − 2) = x2 − 4, 2·(x + 7) = 2x + 14, (4x)2 = 16x2, (x − 3)(x + 3) = x2 − 9, 7x3+2x3=9x3, Netočno: 6x − x = 6, 5x + 7x = 12x2, 7x·3x = 21x, 7x2 + x2 = 7x2, x·(x + 5) = x2 + 5, (x + 5)2 = x2 + 25, 5x3+4x3 = 9x6, 5x+2x = 7x2,

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