tolong di bantu dengan cara

Soal No. 3
= (2x + 3y) - (- 2x + 3y)
= 2x + 3y + 2x - 3y
= (2x + 2x) + (3y - 3y)
= 4x + 0
= 4x ...........Jawaban (B)

Soal No. 4
= (5(y + 1)) - (- 7(y - 2))
= (5y + 5) - (- 7y + 14)
= 5y + 5 + 7y - 14
= (5y + 7y) + (5 - 14)
= 12y - 9 ...........Jawaban (D)