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=9x-7
2. =2x+3y+5+x-y-1
=3x+2y+4
3. =a+b+3+a-b+1
=2a+4
=9x-7
b. =2x+3y+5+x-y-1
=3x+2y+4
c. =a+b+3+a-b+1
=2a+4