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=15x-5-12x+9
=15x-12x-5+9
=3x+4
2.2(4x+y)-3(3x-2y)
=8x+2y-9x+6y
=8x-9x+2y+6y
=-x+8y
3.p(2q+5)=2pq+5p
5-10p+15pq=5+5p2q
4.(2x-2)(x+5)=2x(x+5)-2(x+5)
=2x2+10x-2x-10
=2x2+8x-10
5.(x-4y)(12x2-16xy+9y2)
=x(12x2-16xy+9y2)-4y(12x2-16xy+9y2)
=12x2-16x2y9xy2-48x2y+64xy2+36y3