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2. 3p + q - 2p - 5q + 7 = p - 4q + 7
3. 3x^2 + 2x - 1 + x^2 - 5x + 6 = 4x^2 - 3x + 5
4. 2x + 4y - 2xy + 10x - 15y + 25xy = 12x - 11y + 23xy
2x+8+4x-5-5y
2x+4x-5y+8-5
6x-5y+3
2. (3p+q)+(-2p-5q+7)
3p+q-2p-5q+7
3p-2p+q-5q+7
p-4q+7
3. (3x^2+2x-1)+(x^2-5x+6)
3x^2+2x-1+x^2-5x+6
3x^2+x^2+2x-5x-1+6
4x^2-3x+5
4. 2(x+2y-xy)+5(2x-3y+5xy)
2x+4y-2xy+10x-15y+25xy
2x+10x+4y-15y-2xy+25xy
12x-11y+23xy