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Woodscreative · Answer 1 · 2018-09-09T19:11:15+0000

a - 2b + 3c - (a - 2b -3c + d)

Note that the exercise is asking for the negative form of the 2º equation, so we need to multiply it by (-1)

a - 2b + 3c - a + 2b + 3c - d

simplify the equation

(a - a) + ( 2b - 2b) + (3c + 3c) + (-d)

6c - d

B.

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