5ab³ + 1ab³ - 6ab³, -30a³ : 3a - -10a², 3y + 5y +18 + 8y= - 16y + 18, x + y - 3x - 2y - -2x-y, 2xy + 3xy - 5xy, 3( x - 2) - 3x - 6, -2x (3x + 4 ) - -6x² - 8x , 2x+6+2x+4 - 4x + 10, 1/2 a + 1/2 a - 1a, -1a . (-1a) - 1a², 5b - 4b - 1b, 5b . (-4b) - -20b², 10 x³ : 5x - 2x², (-2a)² - 4a², (xy) -³ - x-³ . y-³,

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