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=9x-12y + 4x+2y
9x-12y
4x+2y
________+
13x-10y
2) -(-3a+b) + (b-a)
=3a-b + b - a
= 3a - a
= 2a'
3) -(3a+1)+(a-1)
= -3a-1 + a - 1
= -3a+a -1-1
= -2a-2
= 9x + 4x - 12y + 2y
= 13x - 10y
2) - (3a + b) + (b - a) = 3a - b + b - a
= 3a - a - b + b
= 2a
3) - (3a + 1) + (a - 1) = - 3a - 1 + a - 1
= - 3a + a - 1 - 1
= - 2a - 2