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t + 6
2) x^{4} – 5x^{4} + x^{2} – 6x^{2}
= x^{4} – x^{2}
3) x^{2} + 8y + x + 3x^{2} + 4y
x^{2} + y +
4) 8m – 15k – 16m + 30k
= m +
5) 4b + b + a + ab
b + + ab
6) -2xy – 3xy + 6xy – x^{2}
= – x^{ }
7) 45b + 8bc – 2b – 3bc
b} + bc
8) –xyz – 8xyz – 2xyz
= xyz
9) 3d + d^{2} + bd + b
= + + +
10) xy + 4xy + x^{2}y^{2} + 6x^{2}y^{2}
= xy + 7x^{ }y^{ }