Question

Efetue as expressões a seguir:

a) 3(x - 7)
b) -3(x - 7)
c) -(2x - 1)
d) -5(-3x - 4)

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Answer 1

a) $3(x-7)=3x-21$

b) $-3(x-7)=-3x+21$

c) $-(2x-1)=-2x+1$

d) $-5(-3x-4)=15x+20$