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( x2 + 1 ) - ( x2 - 2 ) + 10 = ( 4,84 +1 )- ( 4,84 - 2 ) + 10 = 5,84 - 2,84 + 10 = 13
(a + 4b) - (5 + 2a) - (3b - 5) = -0,1 + 0,8 - 5 + 0,2 - 0,6 + 5 = 0,3
( -a2 + 2ab - 1 ) + ( a2 - 4ab + 5 ) = 1 - 1 - 2 + 5 = 3