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(3x - 4) + ( - x + 4) + (2x - 6)=
3x - 4 - x + 4 + 2x - 6 = 4x - 6
b)
( 2a² - a + 4) + ( a² + 4a - 3) =
2a² - a + 4 + a² + 4a - 3 = 3a² + 3a + 1
a)
(6x + 1) - ( 4x - 2) =
6x + 1 - 4x + 2 = 2x + 3
b)
23a - ( 12b - 81a) - 15b=
23a - 12b + 81a - 15b = 104a - 27b