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=> -2 ( 2x - 1 ) - 5 ( x + 6 )
= -4x + 2 - 5x - 30
= -9x - 28
______________
b).
=> ( 5x + 2 ) - 6 ( -2x - 3 )
= 5x + 2 + 12x + 18
= 17x + 20
______________
c).
=> 10 ( 6x + 12 ) - 3 ( 10 - 8x )
= 60x + 120 - 30 + 24x
= 84x + 90