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= 6x + 30 - 8x - 4
= 6x - 8x + 30 - 4
= -2x + 16
b) 2(3y - 1) - (-5(3y + 2)
= 6y - 2 + 15y + 10
= 6y + 15y - 2 + 10
= 21y + 8
b. 2(3y-1) - [-5(3y+2)] = 6y - 2 - (-15y - 10) = 21y + 8