how do I do this question confused.
a) 18x-1-(-3x+7) = 18x-1+3x-7 = 21x-8
b) (-3x+7)(18x+1)= -54x^2-3x+126x+7 = -54x^2+123x+7
c) 18(-3x+7)+1 = -54x+126+1= -54x+127
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